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Known Faults Database

Audi A4 problems, reliability and years to avoid

If you are considering buying a used Audi A4, these are the common problems worth knowing about first. Our garage database tracks 19 known faults for this model, 14 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.

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Is the Audi A4 reliable?

The Audi A4 has 19 known faults in our database across 4 generations, 14 of them rated high severity. The most serious are gearbox (recurrent clutch and Dual Mass Flywheel (DMF) failures, often manifesting as juddering) and fuel system (manufacturer recall to replace Siemens Piezoelectric injectors on 2.0 TDI PD engines). None of them makes the car a bad buy on its own; the risk is a seller who knows and says nothing.

That is a count of the faults we hold, not a reliability score. Popular cars get written about more, and a newer generation has had less time to show its faults.

Which Audi A4 years should you avoid?

No year is a write-off on its own. What matters is which serious faults a given year and engine can have, and whether the car in front of you has had them fixed.

B5, 1995 to 20001 high severity
1 known fault, the serious ones in the electrics
B6 / B7, 2001 to 20097 high severity
9 known faults, the serious ones in the fuel system, engine, gearbox, brakes
B8, 2008 to 20156 high severity
8 known faults, the serious ones in the gearbox, engine, electrics
B9 Avant, 2015 to 2025
1 known fault, none rated high severity

Years and engines with a serious known fault

  • 2008 to 2015, Manual 2.0 TDI / 1.8 TFSI: recurrent clutch and Dual Mass Flywheel (DMF) failures
  • 2006 to 2009, 2.0 TDI PD (BMN and related codes) with Siemens piezo injectors: manufacturer recall to replace Siemens Piezoelectric injectors on 2.0 TDI PD
  • 2004 to 2015, 3.0 TDI V6: the 3.0 TDI V6 engine is prone to water pump failure
  • 2007 to 2017, All: recall R/2017/334 for auxiliary heater element in air conditioning system
  • 2007 to 2017, EA888 2.0 TFSI: recall issued for the additional coolant pump on EA888 2.0 TFSI engines
  • 2006 to 2008, 3.0 V6 TDI: piezoelectric injector failure is a known problem on the 3.0 V6 TDI

Each one is set out in full below, with the symptoms, the typical mileage and a rough repair cost.

Generation 1 of 41 known fault · 6 good notes

Audi A4 B5 (1995 to 2000) problems

ElectricalHigh severity📝 Editorial

Blocked ventilation plenum chamber drains (especially under the battery) lead to water ingress, causing electrical and electronic problems, including potential ECU damage and brake servo corrosion. Water can collect in the rear footwell.

Rough guide
£500-2000+

Typical symptoms

  • Electrical malfunctions (e.g., immobiliser issues)
  • Damp carpets in footwells
  • Hard brake pedal (loss of servo assistance)
  • Engine running issues (if ECU damaged)

Affected vehicles

Engines:
All
Typical mileage:
Any miles
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What owners like about the B5

6 notes
  • The Audi A4 features a good-looking, galvanised body, contributing to its overall build quality and appearance.
  • The 2.6 V6 engine, available from March 1996, is a pleasant unit that consistently achieves around 30 miles per gallon.
  • TDI 90 and TDI 110 engines are popular for their fuel efficiency, delivering up to 50 miles per gallon with careful driving.
  • The model was significantly updated in Spring 1999, gaining a 115 bhp Pumpe Duse TDI engine option from late that year.
  • Production concluded with the limited edition 350 bhp RS4 model, marking the end of the line for this generation.
  • The A4 generally exhibits a low death rate from accidents, scoring 3 out of 9 points in safety assessments.
End of the B5 section.Pick another year ↑Check a Audi A4 advert →
Generation 2 of 49 known faults · 7 owner reports · 1 good note

Audi A4 B6 / B7 (2001 to 2009) problems

Engine/EmissionsHigh severity📝 Editorial

Oil pump balancer shaft hex drive rounds off, causing sudden loss of oil pressure and complete engine destruction

Rough guide
£1500-3000

Typical symptoms

  • red low oil pressure warning on dash
  • loud metallic grinding from the bottom of the engine
  • sudden turbo failure

Affected vehicles

Engines:
2.0 TDI PD (Engine Code BLB / BRE)
Typical mileage:
60000-100000 miles
6 more owner reports back this up
  • October 2019The 2.0 TDI PD engine's oil pump drive, a 6 AF hex bar, has inadequate engagement depth, leading to wear and failure.
  • July 2014A 2007 Audi A4 2.0 TDI Cabrio with 60,000 miles experienced an oil pump failure, leading to a £5,500 engine and turbo replacement quote.
  • April 2014An A4 B7 2.0 TDI with 105,000 miles broke down, running on three cylinders, likely due to oil pump drive failure, costing £2,500 to repair.
  • January 2014A 2005 A4 B7 2.0 TDI BLB Avant experienced an oil pump chain drive failure, caused by misalignment reducing hex shaft engagement.
  • January 2014A 2005 2.0 TDI BLB engine with 105,000 miles had an oil pump drive failure, costing £2,324.25 for repair, then a free engine replacement.
  • January 2014A 2005 2.0 TDI BLB engine experienced oil pump drive failure, costing £4,000 for replacement, but the engine failed again ten months later.
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Transmission/ClutchHigh severity📝 Editorial

Multitronic CVT gearbox clutch pack wear and TCM failure causing juddering and total loss of drive

Rough guide
£1500-3500

Typical symptoms

  • juddering or shaking when pulling away from a standstill
  • PRNDS display flashing on the dashboard
  • car refuses to shift out of park or neutral

Affected vehicles

Engines:
All Front-Wheel-Drive Autos
Typical mileage:
60000-100000 miles
5 more owner reports back this up
  • November 2017A 2007 Audi A4 2.0 Multitronic made a clunking noise when accelerating, then lost all drive, with the selector not registering.
  • February 2017A 2007 Audi A4 2.0 TDI 140 Multitronic also suffered a complete loss of drive.
  • September 2015The input shaft failed on a 58,000 mile 2012 A4 2.0 TDI CVT Multitronic, requiring a transmission rebuild.
  • September 2015A 2012 A4 2.0 TDI CVT Multitronic with 58,000 miles experienced input shaft failure, necessitating a transmission rebuild.
  • February 2013A Multitronic transmission failed at two years and ten months, and was subsequently replaced under warranty.
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Engine/EmissionsHigh severity📝 Editorial

Oil sludge buildup blocking the oil pump pickup pipe, leading to catastrophic oil starvation

Rough guide
£1000-2000

Typical symptoms

  • red oil pressure warning light
  • noisy hydraulic lifters (ticking sound)
  • turbocharger failure due to lack of oil

Affected vehicles

Engines:
1.8T (20 Valve)
Typical mileage:
70000-110000 miles
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Bodywork/ChassisMedium severity💬 Owner reports

Rust along the rear wheel arch lips, starting on the inside edge of the arch where stone chips break the galvanised protection and creeping around to bubble on the visible face. It is so consistent on B6 Avants especially that owners report every example of that age showing the same arch rust, and fronts sometimes follow. Cosmetic rather than structural, but a proper repair is cut-and-weld or a new arch lip plus paint, and a cheap blow-over bubbles again within a year or two.

Rough guide
£250-900

Typical symptoms

  • bubbling along the rear arch lip, often both sides
  • rust visible on the inside edge of the arch before the outside shows
  • mismatched paint or texture on the arches from a previous cheap repair

Affected vehicles

Engines:
All
Typically appears:
10-20 years
1 more owner report backs this up
  • September 2015Both rear wheel arches of a 2006 Audi A4 were found to be rusting under the paint, indicating previous poor repairs.
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Fuel SystemHigh severity💬 6 owner reports, 2011 to 2012

Manufacturer recall to replace Siemens Piezoelectric injectors on 2.0 TDI PD engines (e.g., BMN code) from 2006-2009. A short circuit within the injectors can cause the fuel system to shut down and the engine to cut out. All four injectors are replaced free of charge. The engine is the 170PS PD unit: in the Audi range it is confirmed on the A3 8P (BMN) and the A4 B7 (BRD, including the B7 Cabriolet). The common-rail 2.0 TDI (CEGA) that replaced the PD engine from 2009 is not affected, and neither are the 2.0 TDIs that were common-rail from the day they arrived, so check the engine code on the V5C or the cambelt sticker before assuming a car is covered.

Rough guide
£0 (free recall)

Typical symptoms

  • Engine cutting out unexpectedly
  • Loss of power
  • Engine management light illuminated
  • Rough running or misfires

Affected vehicles

Engines:
2.0 TDI PD (BMN and related codes) with Siemens piezo injectors
Typical mileage:
Any miles
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BrakesHigh severity📝 Editorial

Water ingress from blocked ventilation plenum chamber drains can perforate the brake servo, causing internal rust and potential water ingestion into the engine (hydraulicking). This leads to a hard brake pedal and loss of servo assistance.

Rough guide
£500-1500

Typical symptoms

  • Hard brake pedal
  • Loss of brake servo assistance
  • Engine running rough or seizing (if water ingested)
  • Dampness in footwells

Affected vehicles

Engines:
All
Typical mileage:
Any miles
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Engine/EmissionsHigh severity📝 Editorial

Reports of cracked engine blocks on the 3.0 V6 petrol engines.

Rough guide
£3000-6000+

Typical symptoms

  • Coolant loss
  • Overheating
  • White smoke from exhaust
  • Engine misfires

Affected vehicles

Engines:
3.0 V6 Petrol
Typical mileage:
Unknown miles
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SuspensionMedium severity📝 Editorial

The front anti-roll bar suffered from corrosion under plastic collars, causing them to split and requiring replacement of the entire bar. Audi later introduced a modified bar with metal collars. Audi may contribute to repair costs if the car has been fully maintained.

Rough guide
£485+

Typical symptoms

  • Knocking or rattling noises from the front suspension
  • Reduced handling stability
  • Uneven tyre wear

Affected vehicles

Engines:
All
Typical mileage:
Unknown miles
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Fuel SystemHigh severity💬 3 owner reports, 2013

Piezoelectric injector failure is a known problem on the 3.0 V6 TDI, with the first sign often being white smoke. Replacement of all six injectors is very expensive. Contemporary high-output 2.0 TDIs also reportedly suffer from this issue.

Rough guide
£2300-3500

Typical symptoms

  • White smoke from the exhaust
  • Rough running or misfires
  • Reduced engine power
  • Increased fuel consumption

Affected vehicles

Engines:
3.0 V6 TDI
Typical mileage:
80000+ miles
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What owners report on the B6 / B7

7 single reports, unconfirmed

One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.

  • Electrics · December 2018A 2006 Audi A4 TDI Avant experienced front windows opening and hazard lights activating unexpectedly, possibly due to moisture ingress.
  • Engine · September 2016A 2006 A4 Cabriolet 2.0 Turbo Petrol S-Line with 63,000 miles suffered an oil pump chain failure, destroying the engine.
  • Bodywork · February 2014The drains to the sills may need regular cleaning to prevent water accumulation inside them.
  • Engine · November 2012If a high mileage diesel turbo fails, carbon-choked oil feed pipes should be replaced to prevent new turbo failure.
  • Gearbox and clutch · October 2012The F125 Sensor in a Multitronic gearbox required replacement, incurring a repair cost of approximately £1,500.
  • Engine · May 2012A 2007 A4 2.0 TDI 170 Quattro with 40,000 miles had a new steering rack and turbo under warranty, injectors replaced, and oil in coolant.
  • Gearbox and clutch · February 2011Multiple reports indicate Multitronic ECU failures on models produced between 2002 and 2007.

What owners like about the B6 / B7

1 note
  • This model presents a classy exterior appearance and offers a refined, high-quality feel inside the cabin.
End of the B6 / B7 section.Pick another year ↑Check a Audi A4 advert →
Generation 3 of 48 known faults · 14 owner reports · 11 good notes

Audi A4 B8 (2008 to 2015) problems

Engine/EmissionsHigh severity📝 Editorial

Piston ring design flaw leading to extreme oil consumption and eventual engine failure

Rough guide
£2500-4500

Typical symptoms

  • burning 1 litre of oil every 500-1000 miles
  • blue smoke from exhaust under acceleration
  • oil fouled spark plugs causing misfires

Affected vehicles

Engines:
1.8 TFSI / 2.0 TFSI (EA888 Gen 2)
Typical mileage:
50000-90000 miles
7 more owner reports back this up
  • December 2018A 2010 Audi A4 B8 Avant with the EA888 2.0 TSI engine reported very high oil consumption.
  • November 2018A 2009 Audi A4 2.0 TSI suffered dual mass flywheel failure and piston ring failure, leading to oil consumption of one litre per 250 miles.
  • September 2016A 2009 Audi A4 2.0 TFSI Avant Quattro with 91,000 miles had severe oil consumption, needing oil every 300 miles after PCV valve replacement.
  • January 2016A 2010 Audi A4 1.8 TFSI Multitronic reported using one litre of oil every 1,500 miles.
  • August 2013A 2008 Audi A4 Avant 2.0 TFSI Quattro with 58,000 miles reported excessive oil consumption, needing an engine rebuild.
  • May 2011A 6-month-old, 4,000 mile A5 2.0 petrol engine required modification due to excessive oil consumption, a known design fault.
  • March 2011A 2.0 TFSI engine exhibited heavy oil consumption, using approximately one litre every 1,000 miles.
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Engine/EmissionsMedium severity📝 Editorial

EGR valve failure and DPF blockage frequently occurring after the 'Dieselgate' emissions software update

Rough guide
£400-900

Typical symptoms

  • flashing glow plug light
  • engine management light
  • limp mode (loss of power)
  • excessive DPF regenerations

Affected vehicles

Engines:
2.0 TDI (EA189)
Typical mileage:
60000-100000 miles
4 more owner reports back this up
  • September 2018A 2014 Audi A4 B8 2.0 TDI Teknik at 42,000 miles had an emission light come on after an ECU reflash, requiring multiple garage visits.
  • July 2018A 2014 Audi A4 B8 2.0 TDI at 40,500 miles had the 'Emission Control System' lamp illuminate, requiring DPF regeneration and a new exhaust sensor.
  • March 2017A 2009 Audi A4 2.0 TDI produced significant smoke after a NOx emissions fix; unplugging the Mass Airflow Meter stopped it.
  • March 2017The fuel economy of an Audi A4 2.0 TDI dropped from 620 to 570 miles per tank after the NOx emissions fix.
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Engine/EmissionsHigh severity💬 5 owner reports, 2011 to 2013

The 3.0 TDI V6 engine is prone to water pump failure and coolant loss from the water-cooled EGR valve. This can lead to overheating and significant repair bills.

Rough guide
£250-1200

Typical symptoms

  • Coolant loss
  • Engine overheating
  • Warning lights on dashboard
  • Reduced heater performance

Affected vehicles

Engines:
3.0 TDI V6
Typical mileage:
95000+ miles
1 more owner report backs this up
  • March 2011A 3.0 TDI quattro experienced water pump failure and coolant loss from the water-cooled EGR valve.
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Transmission/ClutchHigh severity💬 8 owner reports, 2012 to 2019

Recurrent clutch and Dual Mass Flywheel (DMF) failures, often manifesting as juddering, particularly on 2.0 TDI and 1.8 TFSI manual models. This can occur at relatively low mileages and may require multiple replacements. An undated Audi TSB mentioned a modified clutch release fork.

Rough guide
£1500-2000

Typical symptoms

  • Clutch judder when pulling away, especially in 1st gear at low RPM
  • Difficulty engaging gears
  • Slipping clutch
  • Vibration through the pedal

Affected vehicles

Engines:
Manual 2.0 TDI / 1.8 TFSI
Typical mileage:
20000-76000 miles
3 more owner reports back this up
  • January 2016A manual 2011 Audi A4 Avant with 76,000 miles reported juddering from the drivetrain.
  • January 2015A manual 2011 Audi A4 Avant with 76,000 miles reported juddering from the drivetrain.
  • January 2014The flywheel of a 2011 A4 1.8 TSI Avant with 52,000 miles lost three teeth, causing difficult starting.
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ElectricalMedium severity💬 2 owner reports, 2013

Water leaks onto the driver's and front passenger's feet due to faulty bulkhead cable seals. This can affect the ECU and lead to electrical problems. Audi dealers typically fix this under warranty or goodwill.

Rough guide
£300-800

Typical symptoms

  • Dampness on driver's or passenger's footwell carpet
  • Intermittent electrical faults
  • Warning lights on dashboard

Affected vehicles

Engines:
All
Typical mileage:
Any miles
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Engine/EmissionsHigh severity💬 2 owner reports, 2019

Failure of the N488 coolant regulator, which can track coolant to the V50 coolant pump and back up the wiring loom to the engine ECU, causing the car not to start and potentially further damage to other electronic control units like the handbrake module. Repairs are very expensive.

Rough guide
£4000-5000

Typical symptoms

  • Car will not start
  • Engine ECU failure
  • Handbrake control unit failure

Affected vehicles

Engines:
1.8 TFSI (Engine Code CJE)
Typical mileage:
39000-40000 miles
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ElectricalHigh severity💬 4 owner reports, 2018

Recall R/2017/334 for auxiliary heater element in air conditioning system. The element may fail due to overheating in the connectors, leading to smoulder damage or potential fire. The fix involves fitting an optimised element and updating AC software.

Rough guide
£0 (free safety recall)

Typical symptoms

  • Smell of burning plastic
  • Overheating in the air conditioning area
  • Auxiliary heater malfunction

Affected vehicles

Engines:
All
Typical mileage:
Any miles
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Engine/EmissionsHigh severity💬 4 owner reports, 2017

Recall issued for the additional coolant pump on EA888 2.0 TFSI engines. Foreign particles in the coolant can block the pump, causing it to overheat. The fix involves a software update to deactivate the pump if a malfunction occurs, and replacement if it has already failed.

Rough guide
£0 (free safety recall)

Typical symptoms

  • Engine overheating
  • Coolant pump malfunction warning
  • Loss of coolant

Affected vehicles

Engines:
EA888 2.0 TFSI
Typical mileage:
Any miles
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What owners report on the B8

14 single reports, unconfirmed

One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.

  • Suspension and steering · July 2019A 2014 Audi A4 1.8 TFSI CVT experienced a "rolling sensation" at speed, suggesting potential failure of the dampers.
  • Fuel system · December 2018The AdBlue refill reminder on a 2015 Audi A4 B8 did not reset after the tank was refilled.
  • Electrics · February 2018The MMI system in a 2014 Audi A4 failed at 14,000 miles, showing a blank screen and no control lights, requiring a £3,500 replacement of the main controller.
  • Suspension and steering · August 2017The front offside wheel bearing of a 2014 Audi A4 B8 failed at 36,000 miles, with the dealer charging for its replacement.
  • Electrics · November 2016The alternator on a 2011 Audi A4 2.0 TDI failed shortly after a routine timing belt replacement, possibly due to an overtightened aux belt.
  • Electrics · February 2016A dark patch in the centre of the full beam persisted even after new headlight units were installed.
  • Engine · April 2015A 2013 Audi S4 Avant with 16,000 miles suffered loss of oil pressure when hot, despite sensor and oil pump replacements.
  • Suspension and steering · May 2014Both front wheel bearings failed on a 2009 Audi A4 2.0 TDI at 80,000 miles, with a repair quote of £538.
  • Brakes · May 2014The electric parking brakes on a 2008 Audi A4 stopped functioning, indicating a fault with the system.
  • Engine · August 2013A 21-month-old 2.0 TDI with 25,000 miles experienced turbo failure, with the turbo, exhaust, and DPF replaced under warranty.
  • Engine · August 2013A turbocharger failed on a 21-month-old 2.0 TDI at 25,000 miles; the turbo, exhaust, and DPF were replaced under warranty.
  • Engine · May 2013Turbo oil seal problems on the 2.0 TDI 143 can cause excessive oil in the combustion chamber, potentially leading to engine damage.
  • Suspension and steering · August 2012The 2.0 TDI Multitronic can experience power steering pump low pressure at low speeds, causing vibration.
  • Suspension and steering · August 2012The 2.0 TDI 143 Multitronic can experience power steering pump low pressure at low speeds, causing vibration.

What owners like about the B8

11 notes
  • June 2009Audi received the 4th overall Manufacturer Award in the British Insurance Vehicle Security Awards.
  • The car achieved a 5-star Euro NCAP rating for adult protection, 4-star for child protection, and 2-star for pedestrian protection.
  • The A4 range was voted the most secure in the compact executive class, highlighting its strong security features.
  • The vehicle is noted for its excellent build quality, contributing to its overall durability and premium feel.
  • This model offers a vast selection of engines and trim levels, providing extensive customisation options for buyers.
  • Most 2.0-litre TDI diesels offer a good balance of performance and fuel efficiency, achieving around 50 miles per gallon.
  • The 3.0-litre V6 diesel engines provide rapid acceleration while maintaining reasonable fuel economy.
  • The range of TFSI petrol engines are known for their smooth operation and quick responsiveness.
  • The load space is well-designed, although it is not the largest available in the market segment.
  • The car's desirability and high quality contribute to strong residual values in the used car market.
  • Quattro four-wheel drive provides very stable handling, particularly enhancing grip and control in wet conditions.
End of the B8 section.Pick another year ↑Check a Audi A4 advert →
Generation 4 of 41 known fault · 12 owner reports · 13 good notes

Audi A4 B9 Avant (2015 to 2025) problems

Engine/EmissionsMedium severity💬 2 owner reports, 2018 to 2019

Persistent vibrations through the accelerator pedal and steering wheel, often simultaneously, particularly at 1,250 rpm and 1,750-2,250 rpm. The engine can also be unrefined and noisy on acceleration. This has been reported even after replacement of expensive parts like camshafts, crankshaft, and chain tensioners under warranty.

Rough guide
£Unknown (potentially very high)

Typical symptoms

  • Vibration through accelerator pedal and steering wheel
  • Unrefined or noisy engine on acceleration
  • Throbbing/pulsing sensation at certain RPMs

Affected vehicles

Engines:
3.0 TDI V6 272HP
Typical mileage:
45000+ miles
1 more owner report backs this up
  • December 2019A 2015 Audi A4 B9 Avant 3.0 TDI V6 272PS exhibited a throbbing noise and vibration between 1,750rpm and 2,250rpm.
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What owners report on the B9 Avant

12 single reports, unconfirmed

One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.

  • Electrics · May 2021The Adblue module control unit failed on a 2016 Audi A4 Avant Ultra 2.0 TDI, with a replacement cost of £930.
  • Electrics · March 2020A three-month-old car experienced intermittent infotainment system error messages regarding user data, awaiting a software fix.
  • Engine · December 2019The EGR valve failed on a 2015 Audi A4 2.0 TDI at 60,000 miles, with the replacement costing £1,500.
  • Engine · June 2019A 2018 Audi S4 Avant suffered an engine failure, leading to a long wait for repair.
  • Interior · February 2019A new Audi A4 B9 developed a soft knocking sound near the driver's right ear when driving on rough surfaces.
  • Suspension and steering · September 2018The 19-inch Continental front tyres on a 2017 Audi A4 S-Line Avant lasted only 6,000 miles.
  • Gearbox and clutch · August 2018A 2016 Audi A4 experienced intermittent shuddering in first gear when releasing the clutch, potentially due to dual mass flywheel damage.
  • Gearbox and clutch · July 2018Two transmission failures occurred on a 2015 Audi S4 within 25,000 miles.
  • Electrics · January 2018A 2016 Audi A4 B9 had its Engine Management Unit replaced after two failures; other issues included an inaccurate electronic dipstick and resetting odometers.
  • Electrics · August 2017A seven-month-old 2017 A4 Avant unexpectedly stopped from 38mph due to a computer fault, which an engineer subsequently repaired.
  • Electrics · July 2017The 'pre-sense' system on a 2016 Audi A4 2.0TDI 170 Avant operated spuriously fifteen times, with increasing frequency.
  • Electrics · December 2016The offside headlamp unit on a 2015 Audi A4 Avant created an unlit patch between its dipped and main beams.

What owners like about the B9 Avant

13 notes
  • This particular model is recognised as a high quality family estate car, offering excellent practicality.
  • The vehicle provides ample head and legroom, comfortably accommodating four large adult passengers.
  • There is a good selection of economical engines available for this model.
  • The interior is classy with abundant technology that is simple to operate.
  • The car's interior boasts seriously impressive material quality throughout, enhancing the cabin experience.
  • This model offers excellent refinement levels, contributing to a comfortable driving experience.
  • The car is efficient, boasting low CO2 emissions and favourable Benefit-in-Kind rates.
  • A wide range of safety and convenience technology is available for this model.
  • The car achieved a five-star Euro NCAP rating, with high scores for adult, child, and pedestrian safety, plus safety assist.
  • The car is incredibly comfortable and quiet while driving, handling poor quality roads effectively.
  • The interior quality represents a significant improvement over the previous A4 Allroad model.
  • A clever new quattro system allows front-wheel drive operation for fuel saving, with no perceptible difference to the driver.
  • This model provides much of an SUV's capability within a less bulky body.
End of the B9 Avant section.Pick another year ↑Check a Audi A4 advert →

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Audi A4 recalls

Recall work is done by the manufacturer, and GOV.UK says you will not usually have to pay for it. These are the 26 DVSA recalls for the A4, newest first. They do not tell you whether this particular car has had the work: for that, put the registration into the free GOV.UK MOT history check, which shows a recall status where the manufacturer shares it, or ask a franchised dealer to check the VIN.

🏛️ August 2025Cars built March 2005 to March 2008

Stop-drive TAKATA PSAN

Urgent Safety Warning - Do Not Drive Your Vehicle Affected vehicles were originally allocated to or used for an extended period of time in a region with a climate zone considered to as HIGH RISK. Certain front airbags contain an ageing inflator propellant that may explode when deployed due to long-term exposure to heat and humidity. If the airbag inflator explodes metal fragments may be ejected causing life-threatening or fatal injuries to anyone in the vehicle.

Put right by: Affected airbags will be be replaced. You can contact Audi's dedicated Takata Stop Drive helpline at 0113 526 9646 (MONDAY to FRIDAY 9:00AM to 5:00PM.

DVSA R/2025/38750 vehicles affected in the UK
🏛️ August 2024Cars built February 2006 to January 2009

Replacing TAKATA driver airbag

On imported Audi vehicles previously used in a warm climate zone and fitted with TAKATA driver airbag manufactured within a specific period it is possible that the gas generator housing may cause small metal parts to become dislodged from the housing and potentially injure the driver or a passenger.

Put right by: As a precautionary safety measure it is necessary to replace the gas generator in the airbag unit on the driver side of the vehicle.

DVSA R/2024/31240 vehicles affected in the UK
🏛️ April 2024Cars built October 2004 to April 2008

Replacing Takata passenger airbag

On affected vehicles the passenger airbag may in extremely rare cases be overloaded and even burst when the passenger airbag is triggered. If this were to happen small metal parts could become dislodged from the housing and potentially cause life-threatening injury to a vehicle occupant.

Put right by: For safety reasons it is necessary to check the passenger airbag and if required to replace the airbag module.

DVSA R/2024/15890,944 vehicles affected in the UK
🏛️ February 2023Cars built October 2004 to April 2008

If a front airbag is deployed it is possible that the gas generator housing in which the propellant is generated may burst on vehicles manufactured within a limited period.

If a front airbag is deployed it is possible that the gas generator housing in which the propellant is generated may burst on vehicles manufactured within a limited period.

Put right by: As a precautionary safety measure it is necessary to replace the airbag unit on the passenger side.

DVSA R/2023/05323 vehicles affected in the UK
🏛️ February 2022Cars built November 2019 to February 2021

Following a previous campaign the toe and/or camber values on the rear axle may in certain circumstances incorrectly be changed without this being noticed

Following a previous campaign the toe and/or camber values on the rear axle may in certain circumstances incorrectly be changed without this being noticed.

Put right by: The wheel alignment must be checked and if necessary the suspension must be serviced on the affected vehicles.

DVSA R/2022/0365,327 vehicles affected in the UK
🏛️ September 2021Cars built April 1997 to December 1999

The deployment of the takata airbag may be delayed or insufficiently powerful due to a potential reduction in the performance of the gas generator

On vehicles with TAKATA driver airbag and NADI gas generator manufactured within a specific period it is possible that the function of the driver airbag may be restricted due to its age.

Put right by: The driver airbag unit must be checked on the vehicles affected and the gas generator must be replaced if necessary

DVSA R/2021/23457,169 vehicles affected in the UK
🏛️ September 2021Cars built January 2000 to August 2001

Function of the driver airbag might be restricted due to its age

On vehicles with 3-spoke steering wheel manufactured within a specific period the function of the driver airbag may be restricted due to its age.

Put right by: The gas generator in the driver airbag must be replaced on the affected vehicles.

DVSA R/2021/3309,536 vehicles affected in the UK
🏛️ June 2021Cars built November 2019 to February 2021

Rear axle suspension links nuts do not meet specifications

One or more nuts which do not meet the specifications may have been fitted on the rear axle suspension links.

Put right by: The affected nuts on the rear axle will be replaced on affected vehicles.

DVSA R/2021/23610,089 vehicles affected in the UK
🏛️ June 2021Cars built December 2015 to December 2018

Vehicles may have been fitted with a hinged towing bracket on which the locking mechanism in the hinge module could be faulty

Vehicles may have been fitted with a hinged towing bracket on which the locking mechanism in the hinge module could be faulty.

Put right by: The hinge module for the towing bracket must be checked and where necessary replaced on the vehicles affected.

DVSA R/2021/204263 vehicles affected in the UK
🏛️ October 2020Cars built July 2020 to July 2020

Seat frame may not be bolted correctly to the rail on the driver and passenger sides

The seat frame may not have been bolted correctly to the seat rail on the driver and/or front passenger side

Put right by: Check the affected seat frame connection and replace the frame if required.

DVSA R/2020/3028 vehicles affected in the UK
🏛️ October 2020Cars built August 2018 to March 2020

Moisture may enter the belt driven starter-alternator

It is possible that moisture may enter the belt-driven starter-alternator.

Put right by: The starter-alternator must be replaced on the affected vehicles.

DVSA R/2020/26511,936 vehicles affected in the UK
🏛️ June 2020Cars built June 2017 to March 2020

Moisture may enter the belt-driven starter-alternator

It is possible that moisture may enter the belt-driven starter-alternator.

Put right by: The starter-alternator must be replaced on the affected vehicles.

DVSA R/2020/13834,982 vehicles affected in the UK
🏛️ June 2019Cars built December 2015 to December 2018

The locking mechanism in the hinged towing bracket could be faulty

Hinged towing bracket on which the locking mechanism in the hinge module could be faulty.

Put right by: The hinge module for the towing bracket must be checked and replaced if required.

DVSA R/2019/175135 vehicles affected in the UK
🏛️ May 2019Cars built February 2019 to March 2019

An error in the casting process may affect the rigidity of the shock absorber fork

An error in the casting process may affect the rigidity of the shock absorber fork.

Put right by: The corresponding shock absorber forks must be replaced on the affected vehicles.

DVSA R/2019/14985 vehicles affected in the UK
🏛️ March 2019Cars built February 2014 to September 2016

Fuel may escape from one or both fuel rails

It is possible that fuel may escape from one or both fuel rails (low-pressure side).

Put right by: The fuel rails for the low-pressure side of both cylinder banks must be replaced on the affected vehicles.

DVSA R/2019/0992,763 vehicles affected in the UK
🏛️ December 2018Cars built February 2017 to July 2017

Passenger airbag module bolts securing to the dash panel may be insufficiently tightened

Air bag securing bolts may not be to the correct torque.

Put right by: Check and replace bolts as required.

DVSA R/2018/3658 vehicles affected in the UK
🏛️ June 2018Cars built May 2011 to May 2017

Risk of overheating and failure of additional coolant pump

On affected vehicles moisture may enter the electronic components and cause overheating and failure of the additional coolant pump. localised smoulder damage cannot be ruled out and in individual cases may cause vehicle to catch fire.

Put right by: The additional coolant pump must be replaced and in addition a software update of the engine control unit must be carried out

DVSA R/2018/152137 vehicles affected in the UK
🏛️ April 2018Cars built October 2014 to October 2017

Aluminium trim may partly detach from loudspeaker trim in doors and cause injury to occupants

The aluminium trim may become detached from the loud speaker trim in the front or rear doors. Cuts and other injuries from the sharp edges may occur.

Put right by: The affected vehicles will be recalled and all four aluminium strips on the loud speaker trims will be replaced.

DVSA R/2018/0865,092 vehicles affected in the UK
🏛️ February 2018Cars built April 2011 to July 2015

Auxilliary heater element in air conditioning may fail and/or overheat

The auxiliary heater element in the air conditioner may fail as the result of overheating in the area of the connectors. This can lead to smoulder damage or potentially a fire.

Put right by: Recall the vehicles that are likely to be affected and change the auxiliary heater element for one with optimised electrical connectors.

DVSA R/2018/051114,287 vehicles affected in the UK
🏛️ January 2018Cars built April 2011 to July 2015

Auxilliary heater element in air conditioning may fail and/or overheat

The auxilliary heater element in the air conditioner may fail as a result of overheating in the area of the connectors in conjunction with smoulder damage or potential fire.

Put right by: Recall the vehicles that are likely to be affected and fit an auxilliary heater element with opimised electrical connectors. The activation of the electric auxilliary heater must be adjusted by updating the software for the air conditioning control console.

DVSA R/2017/33433,699 vehicles affected in the UK
🏛️ May 2017Cars built May 2011 to October 2016

Coolant pump may overheat

Foreign particles in the engine coolant can lead to a blockage in the additional coolant pump and cause the pump to overheat.Foreign particles in the coolant can lead to a blockage in the additional coolant pump and cause the pump to overheat.

Put right by: Recall the machines that are likely to be affected and update the software which will deactivate the additional coolant pump in the event of malfunction. If there has been a malfunction of the additional water pump it will be replaced.

DVSA R/2017/1152,844 vehicles affected in the UK
🏛️ February 2017Cars built May 2016 to October 2016

Airbag/belt tensioners may not trigger in event of an accident

Due to an error in the manufacturing process the air bag and/or seat belt pretensioner may not trigger in the event of a collision

Put right by: On affected vehicles replace air bag assembly and seta belt pretensioner where necessary.

DVSA R/2017/0782,622 vehicles affected in the UK
🏛️ January 2017Cars built August 2016 to October 2016

Front backrest may not perform correctly

The back-rests of the front seats may not have been assembled correctly. This may increase risk of injury to occupants during a collision.

Put right by: On affected vehicles check frames and if necessary replace affected components.

DVSA R/2016/294201 vehicles affected in the UK
🏛️ April 2015Cars built April 2011 to April 2012

Fuel may leak

Fuel may leak from the injector rails. Drivers may notice a smell of fuel and or evidence of a leak

Put right by: On affected vehicles replace injector rails and seals.

DVSA R/2015/0311,073 vehicles affected in the UK
🏛️ December 2014Cars built November 2011 to October 2014

Air bags may not inflate correctly

On affected vehicles the front air bags may not inflate correctly in the event of an accident and not be able to perform their function

Put right by: Reprogramme the airbag control unit with new software

DVSA R/2014/14659,343 vehicles affected in the UK
🏛️ October 2014Cars built January 2012 to August 2014

Reduction in braking performance

On affected vehicles engine oil may in isolated instances enter the brake servo via the vacuum feed lie.This may cause the brake servo diaphragm to rupture and loss of brake servo assistance.

Put right by: Replace vacuum line on affected vehicles.

DVSA R/2014/0985,755 vehicles affected in the UK

Recall data published by the Driver and Vehicle Standards Agency under the Open Government Licence v3.0. A recall listed here may not apply to every car of this model: the build dates and the registration check are what decide it.

Audi A4 cambelt or timing chain, and service intervals

An overdue cambelt is the most expensive thing a seller can fail to mention on a used A4. These are the figures UK specialists work to.

Timing belt (cambelt)Belt
2.0 TDI, EA189, EA288
60,000 miles or 5 years, whichever comes first

Applies to the EA189/EA288 common-rail 2.0 TDI. VW Group UK dropped the time-based interval in 2023 in favour of mileage-only limits, but independent specialists advise replacing belt and water pump every 5 years or 60,000 miles. The earlier pumpe-duse 2.0 TDI (BLB/BRE/BNA) is a different engine with its own longer interval, listed separately.

DSG Oil and Filter
DQ250, 6-SPEED
40,000 miles or 4 years, whichever comes first

The 6-speed wet-clutch DSG/S-tronic takes a fluid and filter change every 40,000 miles. Some specialists recommend 30,000 miles for tuned or heavily used vehicles. (The underlying VW figure is 60,000 km, which UK garages round to 40,000 miles.)

DSG Oil
DQ381, 7-SPEED WET
80,000 miles

The DQ381 7-speed wet-clutch DSG has a manufacturer interval of 80,000 miles, fluid only with no filter change, so it must not be lumped in with the DQ500's 40,000-mile service. Tuners advise sooner (STR Performance suggest a 60,000 km ceiling) on mapped or hard-worked cars.

Timing chainChain
2.0 TSI, 2.0 TFSI, EA888
No fixed replacement interval

EA888 timing chain tensioners fail, giving a cold-start rattle on 2008-2013 cars that escalates to the chain skipping teeth and a full engine rebuild on this interference engine. No official replacement interval; specialists commonly replace before 80,000 miles, and a chain job runs from around GBP 1,500.

Multitronic CVT oil and filter
01J, 0AW
40,000 miles

Audi marketed the multitronic as sealed for life, but the service book specifies an ATF and filter change every 40,000 miles. The job needs the sump off to reach the internal strainer. Neglected units fail expensively through clutch and chain wear, with failures reported anywhere from 30,000 to 120,000 miles and rebuilds often exceeding the car's value; regularly serviced boxes have passed 150,000 miles.

S-tronic gearbox oil and filter
DL501, 0B5, 7-SPEED LONGITUDINAL
40,000 miles

Audi's own maintenance schedule for the 7-speed longitudinal S-tronic: first oil change at 35,000 miles, then every 40,000 miles. The box has two separate oil circuits, clutch/hydraulic ATF plus gear oil, and specialists note the gear-oil side is often skipped. Missed changes are a classic cause of mechatronic faults and harsh shifting.

Automatic gearbox oil
8HP, ZF 8-SPEED, 8HP55, 8HP65
60,000 miles or 8 years, whichever comes first

Audi treats the ZF 8HP tiptronic as filled for life, but ZF, the gearbox maker, publishes official oil-change kits and a change procedure for the Audi 8HP55A/8HP65A/8HP90A/8HP95A units, which contradicts any sealed-for-life reading. UK specialists put the interval at 50,000-60,000 miles or 8 years, sooner for towing, tuned or hard-driven cars.

Timing belt (cambelt)Belt
2.0 TDI PD, B7
75,000 miles or 5 years, whichever comes first

Pre-EA189 pumpe-duse 2.0 TDI (A4 B7 2005-2008, A6 C6 2004-2008). Audi UK customer services and dealer paperwork quoted the cambelt due at 75,000 miles for four-cylinder TDIs, while handbooks of the era say 80,000 miles or 5 years; the shorter 75,000 miles / 5 years is recorded. Interference engine, so replace tensioner and water pump with the belt. This engine is not covered by the EA189/EA288 row and carries a longer interval than it.

Timing belt (cambelt)Belt
2.5 V6 TDI, 2.5 TDI
60,000 miles or 4 years, whichever comes first

Notorious engine. Audi's schedule said 80,000 miles with a check at 40,000 and no time limit, but the 2.5 V6 TDI's reputation for camshaft and rocker wear (pre-2003 AFB/AKN especially) and belt-drive failures means UK garage advice is 60,000 miles and 4-5 years; the shorter 60,000 miles / 4 years is recorded. Interference engine and failure is usually terminal.

Always confirm against the vehicle handbook. Intervals vary by engine, and several manufacturers revised theirs after failures in service.

Repair costs are typical UK ranges, not quotes. Actual cost depends on condition and garage.Data last verified: September 2026

Audi A4 buying questions

What are the most common Audi A4 problems?

Three stand out. Gearbox: recurrent clutch and Dual Mass Flywheel (DMF) failures, often manifesting as juddering (typically 20000 to 76000 miles). Fuel system: manufacturer recall to replace Siemens Piezoelectric injectors on 2.0 TDI PD engines (e.g.. Engine: the 3.0 TDI V6 engine is prone to water pump failure (typically 95000+ miles). The full list above is grouped by generation, with typical mileage and a rough repair cost for each.

Which Audi A4 years should I avoid?

No Audi A4 year is a write-off, but the B6 / B7 (2001 to 2009) carries the most serious faults: fuel system, engine, gearbox and brakes. The B8 (2008 to 2015) and B5 (1995 to 2000) have high-severity faults on record too. The B9 Avant (2015 to 2025) has none rated high severity. Year matters less than whether the specific car has had the known fixes, so check the history for them.

What should I check when viewing a used Audi A4?

Ask the seller about the gearbox, fuel system and engine faults on this page and whether they have been fixed, with invoices. On the test drive watch for clutch judder when pulling away, especially in 1st gear at low RPM, engine cutting out unexpectedly and coolant loss. Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against all 19 known faults before you travel. Check a Audi A4 advert →

Are there any recalls on the Audi A4?

The DVSA lists 26 safety recalls for the Audi A4 issued between 2014 and 2025. The most recent, from August 2025, is "Stop-drive TAKATA PSAN". Recall work is done by the manufacturer, and GOV.UK says you will not usually have to pay for it. This list is by model, so it cannot tell you whether one particular car has had the work: the free GOV.UK MOT history check shows a recall status from the registration where the manufacturer shares it, and a franchised dealer can check the VIN.

What is the real MPG of an Audi A4?

Owners report 41.8 mpg on average across the Audi A4 engines with data, about 82% of the official combined figure. The gap between official and real-world economy varies a lot by engine, so the Real MPG page lists every engine and generation separately, from 3,257 owner submissions. Audi A4 Real MPG by engine →

Looking at an Audi A4 right now? Check the advert before you go and see it.

Where this Audi A4 fault data comes from

If you used to check the Honest John “Good & Bad” section before the site closed in 2026, this page is where that information now lives. We rebuilt the Audi A4 owner-report history from the archived Honest John dataset, added our own research, specialist and owner-club sources and DVSA recall data, and we keep it free. Each fault above is badged with its source. The same data feeds our free advert check, which reads a listing against every known fault for the exact engine and year.

CarAdCheck is not affiliated with Honest John or Volkswagen Financial Services. What happened to Honest John, and where each feature lives now.

Before you go and see it

Knowing what a Audi A4 goes wrong with is half of it. The rest is reading the advert and checking the car's history before you hand any money over.

How to haggle for a used car: negotiate the price with what its records show13 min readHPI check vs carVertical: which is better, and our pick for a UK car9 min readMOT advisories explained: how to check them, and which ones should worry you12 min read
All buyer's guides →

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