Mercedes-Benz C-Class Common Problems & Known Faults (UK)
If you are considering buying a used Mercedes-Benz C-Class, there are several major reliability issues worth knowing about first. Our garage database tracks 23 known faults for this model, 15 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.
Free advert check
Found a Mercedes-Benz C-Class for sale?
Paste the advert and we read it against these 23 known faults, its MOT history and the DVLA record, and tell you what the seller has not. Free, about a minute, no card.
Works with any listing: paste the text from AutoTrader, Gumtree, eBay, Facebook Marketplace or a dealer’s own site.
Generation 1 of 210 known faults · 9 owner reports · 11 good notes
Mercedes-Benz C-Class W202 (1993 to 2008) problems
Engine/EmissionsHigh severity📝 Editorial
Soft metal on the balance shaft timing gear wears completely away, destroying engine timing
Rough guide
£2000-4000
Typical symptoms
Engine Management Light (EML) on
fault codes P0016 / P0017 (camshaft timing)
rough running or misfiring
Affected vehicles
Engines:
3.5 V6 Petrol (M272) / 5.5 V8 (M273)
Typical mileage:
60000-90000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsHigh severity📝 Editorial
Single-row timing chain stretches and jumps teeth, destroying the valves
Rough guide
£1500-2500
Typical symptoms
loud metallic rattle on startup for 3-5 seconds
engine management light
loss of compression and non-start
Affected vehicles
Engines:
1.8 Kompressor / CGI Petrol (M271)
Typical mileage:
60000-90000 miles
7 more owner reports back this up
October 2019The timing chain failed on a 2010 C250CGI petrol at 80,000 miles due to worn guides and sprockets, costing £2,195 plus VAT.
July 2018A 2011 W204 C180 CGI with 70,000 miles and full service history experienced a timing chain failure.
November 2016A 2010 C180 CGI estate with 45,000 miles required a software update and replacement of the timing chain and tensioners for £3,000.
July 2016A 2010 C180 automatic estate had an imminent timing chain failure reported during a 50,000-mile service, costing around £2,000.
May 2016A 2005 C180K coupe experienced a timing chain failure, with Mercedes-Benz contributing to labour costs for a £5,000 repair.
August 2015A 2010 C180 with 42,000 miles experienced premature stretching of the timing chain, which was not resolved by replacing the tensioner.
June 2014A 2006 C180K had a timing chain failure, costing £1,300 to replace, but the engine still ran unevenly.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsMedium severity📝 Editorial
Premature failure of the catalytic converter, leading to an expensive repair bill.
Rough guide
£800
Typical symptoms
Engine warning light illuminated
Reduced engine performance
Failed MOT emissions test
Affected vehicles
Engines:
C180 / C200 / C220 Petrol
Typical mileage:
Unknown miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsHigh severity📝 Editorial
Cylinder head stretch bolts failing on four-cylinder engines, requiring a 'head-off' replacement. Oil leaks from the cylinder head are a common symptom.
Rough guide
£1000-2000
Typical symptoms
Oil leaks from the cylinder head
Overheating engine
Loss of coolant
White smoke from exhaust
Affected vehicles
Engines:
Four-cylinder petrol engines
Typical mileage:
Unknown miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsHigh severity📝 Editorial
Glow plugs can fail and then break during removal, leading to extremely high repair costs due to extensive dismantling required. This is a known issue, especially if the car is a poor starter.
Rough guide
£300-4500
Typical symptoms
Poor starting, especially in cold weather
Engine misfires on startup
Engine warning light
Affected vehicles
Engines:
Diesel engines (e.g., C250TD)
Typical mileage:
50000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
OtherMedium severity📝 Editorial
Severe rusting, particularly around rear wheel arches, body seams, screen surrounds, and boot lids. Lower front suspension control arms can also rust through from the inside out due to design flaws.
Rough guide
£500-2000
Typical symptoms
Visible rust spots or bubbling paint on bodywork
Perforation around wheel arches
Rust on suspension components
Rust on boot lid, especially near drainage holes
Affected vehicles
Engines:
All
Typical mileage:
70000-100000 miles
2 more owner reports back this up
February 2018The front suspension arm of a 2004 C180 Kompressor rusted through, causing the suspension to collapse.
September 2016The rear suspension trailing arms of a 2004 C-Class rusted through and collapsed while driving.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
ElectricalMedium severity📝 Editorial
The mechanism of the single-arm wiper requires frequent greasing and is not typically included in normal Mercedes service schedules. Failure can lead to an expensive replacement.
Rough guide
£800
Typical symptoms
Wiper arm slowing down or sticking
Wiper not moving smoothly across the windscreen
Wiper mechanism making unusual noises
Affected vehicles
Engines:
All
Typical mileage:
Unknown miles
1 more owner report backs this up
December 2011The single-arm wiper on a W202 C-Class may slow down, requiring lubrication of the mechanism with graphite oil.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Fuel SystemMedium severity📝 Editorial
Failure of injector seals, allowing fuel/air mixture to escape and deposit carbon on top of the engine, known as 'black death'. If not caught early, rectification can be costly.
Rough guide
£500
Typical symptoms
Smell of neat fuel (like paraffin) in the cabin
Chuffing sound from the top of the affected cylinder
Visible carbon build-up around injectors
Affected vehicles
Engines:
Diesel engines
Typical mileage:
Unknown miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Transmission/ClutchHigh severity📝 Editorial
Transmission oil cooler, sited within the radiator matrix, can fail and allow coolant to enter the automatic transmission fluid, leading to catastrophic transmission destruction. This fault affects cars manufactured between 2000-2003 only when a Valeo radiator is fitted.
Rough guide
£4000+
Typical symptoms
Harsh or erratic gear changes
Transmission slipping
Transmission warning light
Coolant level dropping without visible leaks
Affected vehicles
Engines:
Automatic transmission with Valeo radiator
Typical mileage:
Unknown miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsHigh severity📝 Editorial
Valve problems due to faulty engine design allowing carbon build-up in valve guides and under valves. If left unfixed, valves may burn out, potentially requiring cylinder head replacement. Symptoms include misfiring, high fuel consumption, and 'check engine' light.
Rough guide
£1900-4000+
Typical symptoms
Engine misfiring
High fuel consumption
Check engine light illuminated
Vehicle entering 'limp home' mode
Affected vehicles
Engines:
M271 1.8 four-cylinder petrol engines
Typical mileage:
Unknown miles
1 more owner report backs this up
February 2012At 200,000 miles, valves may not seat correctly, requiring modified valve springs, a £1,900 repair at a main dealer.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
What owners report on the W202
9 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.
Brakes · October 2017An illuminated ABS and ESC warning light on the dashboard could be caused by a defective brake pedal switch.
Gearbox and clutch · May 2017A 2006 C180K automatic with full service history intermittently failed to shift into Drive.
Gearbox and clutch · May 2017A 2005 C220CDI automatic intermittently locked up, not shifting out of first gear, due to a defective Shift Selector Module.
Engine · October 2016A 2004 C200 automatic experienced rough running at low engine speeds between 40 and 50 mph.
Brakes · October 2013The Sensotronic Brake Control pump on a 2004 C220 CDI failed at 130,000 miles, triggering a dashboard warning; the repair cost was £880 after a goodwill contribution.
Exhaust · October 2012C180K models can suffer catalytic converter problems, with repair bills potentially reaching £4,000.
Engine · December 2011Turbocharger failure occurred on a C220CDI after approximately six years, despite regular oil changes.
Engine · November 2011Supercharger failures were reported on 180K and 200K engines after five to six years, even with annual oil changes.
Engine · August 2011A 2006 C320CDI experienced diesel fuel leaks, engine oil forced out, alternator failure, and a cracked manifold.
What owners like about the W202
11 notes
The galvanised body of this model originally came with a 30-year conditional warranty against corrosion.
Cars from 1998 and 1999 achieved 11th place in a 2001 customer satisfaction survey.
Mercedes-Benz was rated as Britain's second most claim-free used car brand by Motor Warranty Direct.
This model recorded a very low death rate of 2 out of 9 points from accidents.
This model achieved an excellent score of 31 points in the 2001 Euro NCAP crash safety tests.
The model ranked joint second in a 2002 Which? reliability survey, with 99% of 107 cars surveyed being fault-free.
The exhaust system of a 2006 C180 Kompressor estate lasted 245,000 miles before the catalytic converter casing cracked.
The C-Class was a Which? used best buy in 2004 for cars in the £10,000 to £15,000 price range.
This model ranked joint second in a 2002 Which? reliability survey, with 99% of 107 cars surveyed being fault-free.
Mercedes-Benz generally had the ninth lowest average warranty repair costs in the 2003 Warranty Direct Reliability index.
Revisions led to the C-Class range achieving an excellent five-star Euro NCAP award in 2002 tests.
Generation 2 of 213 known faults · 49 owner reports · 17 good notes
Mercedes-Benz C-Class W204 / C-Class (2007 to 2014) problems
Fuel SystemHigh severity📝 Editorial
Piezo Delphi fuel injector failure leading to limp mode and severe misfires
Rough guide
£800-2000
Typical symptoms
engine management light
sudden limp mode
severe juddering and misfire
Affected vehicles
Engines:
2.1 CDI (OM651)
Typical mileage:
40000-80000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsHigh severity📝 Editorial
Oil cooler seals fail in the 'V' of the engine causing massive oil leaks
Rough guide
£800-1500
Typical symptoms
oil pooling in the engine valley
oil leaking down the back of the engine onto the undertray
burning oil smell in the cabin
Affected vehicles
Engines:
3.0 V6 CDI (OM642)
Typical mileage:
60000-100000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
SteeringLow severity📝 Editorial
Severe 'crabbing' or skipping of the front tires on full steering lock in cold weather
Rough guide
£200-800
Typical symptoms
loud clunking from front wheels on full lock (parking)
front end feeling like it is skipping across the road surface
rapid uneven front tire wear
Affected vehicles
Engines:
All (particularly AMG Line and 4Matic)
Typical mileage:
0-50000 miles
8 more owner reports back this up
January 2020The front wheels of an April 2019 C43 AMG were skipping badly and making a loud noise when manoeuvring at low speed.
October 2019The front wheels of a C43 4-Matic were reported to be 'skipping' during low-speed manoeuvres.
April 2019A 2017 C43 AMG 4-Matic experienced front tyre clunking on full lock, with a replacement steering knuckle joint suggested as a fix.
November 2017A 2016 C43 AMG experienced full lock tyre judder, with the owner considering switching to cold weather tyres.
March 2017A 2016 C43 AMG experienced its tyres chuntering on lock, which Mercedes-Benz stated was a characteristic of the car.
March 2017A new C43 AMG experienced tyre chuntering, with the owner unaware of an offer to replace tyres with all-weather versions.
January 2017Tyres on a C43 were reported to be folding over on full steering lock.
January 2017A C43 AMG experienced crabbing on limited lock, suggesting a potential problem with the 4Matic centre differential.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Fuel SystemHigh severity📝 Editorial
Serious issues with piezo injectors cracking, leading to engine malfunction, limp mode, and extended periods off the road due to parts shortages. A TSB was issued to replace these injectors if customers complained.
Rough guide
£1500-2500
Typical symptoms
Engine malfunction light illuminated
Engine entering limp mode
Severe misfires or rough running
Loss of power
Affected vehicles
Engines:
OM651 2.1 CDI (220 CDI / 250 CDI BlueEfficiency)
Typical mileage:
Unknown miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Engine/EmissionsHigh severity📝 Editorial
Premature wear of the timing chain sprocket for the balancer shaft on V6 petrol engines (M272/M273). This is a known issue with a Mercedes-Benz Star bulletin, requiring a major engine-out repair.
Rough guide
£4000
Typical symptoms
Engine warning light
Rough running or misfires
Metallic rattling noise from engine
Diagnostic codes related to camshaft timing
Affected vehicles
Engines:
M272 / M273 V6 petrol engines
Typical mileage:
Unknown miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
OtherMedium severity📝 Editorial
Plastic interior door handles, particularly the driver's side, are prone to breaking as they are an integral part of the door panel and not available separately, leading to high replacement costs. Mercedes-Benz has offered goodwill in Germany but less so in the UK.
Rough guide
£374-500
Typical symptoms
Broken or loose interior door handle
Difficulty opening the door from the inside
Affected vehicles
Engines:
All
Typical mileage:
Unknown miles
1 more owner report backs this up
August 2017The interior door handle broke on a 2010 W204 C-Class, with repair quotes ranging from €545.53 to £434.40 plus fitting.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
SecurityHigh severity📝 Editorial
Failure of the electronic steering lock (ESL) or ignition switch, which can completely immobilise the car. This is a common and expensive repair, often requiring recovery to a Mercedes-Benz garage and parts from Germany.
Rough guide
£520-1034
Typical symptoms
Car fails to start
Steering wheel remains locked
Ignition switch unresponsive
Car completely immobilised
Affected vehicles
Engines:
All
Typical mileage:
38000-42000 miles
3 more owner reports back this up
September 2018A 2008 W204 C180 suffered a steering lock/ignition switch failure, immobilising the car and costing £1,034.40 for repair and recovery.
August 2017A W204 C-Class had a failed steering lock, with the owner billed £700 for its replacement.
June 2015A 2011 C220 with 38,000 miles had a failed steering lock, costing £520.80 to replace.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
OtherMedium severity📝 Editorial
Problems with 'Fire Opal Red' metallic paint, including white blotches, microblistering, and lacquer clearcoat peeling. This is a known issue affecting multiple Mercedes-Benz models, with some owners reporting multiple resprays.
Rough guide
£1000-3000+
Typical symptoms
White blotches or discolouration on red paintwork
Raised pimples or microblistering under the lacquer
Peeling clearcoat, especially on horizontal surfaces like the boot lid or roof
Affected vehicles
Engines:
All (Fire Opal Red metallic paint)
Typical mileage:
Unknown miles
5 more owner reports back this up
April 2019The lacquer clearcoat peeled from the boot lid of a Fire Opal metallic red W204 C250, and the issue spread to other panels.
March 2019A 2013 S204 C-Class estate in Fire Opal metallic red paint developed microblistering over most of its bodywork.
November 2018A 2012 C220 in Fire Opal Red metallic paint developed recurring white blotches on the paintwork, requiring multiple resprays.
January 2018Red paint on a 2013 C-Class Coupe blistered, was repainted under goodwill, but the issue returned after two months.
November 2015Red paint on a 2014 C-Class estate developed bubbles under the lacquer; Mercedes-Benz repainted the car.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
OtherMedium severity📝 Editorial
The 'Artico' artificial leather seat material, particularly on the driver's and front passenger's seats, is prone to tearing or splitting along the seams. This is a recurring issue, even after replacement.
Rough guide
£500-1000
Typical symptoms
Visible tears or splits in the seat upholstery seams
Wear and tear disproportionate to mileage
Affected vehicles
Engines:
All (with Artico upholstery)
Typical mileage:
50000-80000 miles
6 more owner reports back this up
June 2019The Artico seat material on a 2013 C220CDI tore, with Mercedes replacing the driver's seat, but a new hole appeared six months later.
August 2018The Artico artificial leather seating in a W204 C-Class split after three years; Mercedes replaced it, but it split again within a year.
May 2018The Artico leather base of the driver's seat on a 2013 W204 C-Class split along the seam.
July 2017The Artico seat cover material split on a 2012 C-Class with 87,000 miles.
July 2017The front seat upholstery on a 2009 Mercedes-Benz C-Class split along the seams three separate times.
June 2015The Artico seat material on the driver's and front passenger's seats of a 2008 C180 with 52,000 miles tore along the main seams.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
OtherHigh severity📝 Editorial
Corrosion of brake pipes, leading to MOT advisories and eventual failure. Replacement of all brake pipes can be a very expensive job.
Rough guide
£2400
Typical symptoms
MOT advisory for corroded brake pipes
Brake fluid leaks
Spongy brake pedal (in severe cases)
Affected vehicles
Engines:
All
Typical mileage:
45000-100000 miles
🔍 We have a specific pre-purchase check for this faultCheck an advert →
Transmission/ClutchHigh severity📝 Editorial
Various automatic transmission problems reported, including sticking in gear, juddering, lurching at low speed, and torque converter failure. Issues often require software updates, fluid changes, or component replacement (e.g., speed sensor, servo valve).
Rough guide
£396-1644
Typical symptoms
Transmission sticking in gear (e.g., 3rd or 1st)
Juddering or lurching at low speed
Harsh or 'jumping' gearchanges
Failure to change gear, especially at the start of a journey
Engine fault light showing with transmission issues
Affected vehicles
Engines:
7G-Tronic / 9G-Tronic automatic transmissions
Typical mileage:
27000-108000 miles
3 more owner reports back this up
November 2019A 2017 C43 Coupe with 24,000 miles had problems with its 9G Geartronic transmission, showing an ESM - U24FF fault code.
May 2019A 2015 C220 CDi 7G-Tronic Coupe with 46,000 miles was sticking in first gear, diagnosed as a failed servo valve in the control unit.
April 2019A 2015 C-Class Coupe 2.2 C220CDi 7G-tronic became stuck in gear, diagnosed as a speed sensor fault in the gearbox.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
SuspensionHigh severity📝 Editorial
Failure of the electric power steering motor, which is integrated into the steering rack. This leads to a loss of power steering assistance and requires replacement of the entire steering rack. A safety recall (R/2017/159) was issued for this.
Rough guide
£2200
Typical symptoms
Loss of power steering assistance
Steering becomes very stiff
Power steering warning lamp illuminates
Affected vehicles
Engines:
All
Typical mileage:
Unknown miles
1 more owner report backs this up
October 2020An electric steering motor failed on a 2016 C-Class, requiring a full steering rack replacement at £2,200, with Mercedes-Benz covering 50 per cent.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
ElectricalHigh severity💬 1 owner report, 2017
A broken steering column spring, coupled with insufficiently earthed wiring, may lead to a short circuit and inadvertent deployment of the driver's airbag. This was subject to a voluntary recall by Mercedes-Benz.
Rough guide
£0 (free safety recall)
Typical symptoms
Airbag warning light appearing on the dashboard
Unexpected airbag deployment
Affected vehicles
Engines:
All variants
Typical mileage:
All mileages miles
1 more owner report backs this up
October 2018A 2013 W204 C220 involved in an accident experienced brake failure and airbag malfunction, despite a prior airbag earthing recall.
🔍 We have a specific pre-purchase check for this faultCheck an advert →
What owners report on the W204 / C-Class
49 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.
Engine · October 2022A 2011 C250 CDI with 162,000 miles experienced a drive chain failure, with engine repair costs estimated at £3,000 to £4,000.
Fuel system · February 2020A 220 diesel C-Class experienced a 9mpg drop in fuel economy after a voluntary dealer emissions software update.
Brakes · January 2020The brakes of a 2015 C300 D BlueTec hybrid failed at 88,000 miles due to a faulty servo assistance vacuum pump.
Engine · December 2019A 2019 C200 EQ Boost developed a serious engine rattle shortly after purchase; despite multiple part replacements, the noise persisted, leading to a rejection attempt.
Gearbox and clutch · November 2019After a NOx emissions software update, a C250d 4matic would not shift into 9th gear until 75mph, up from 68mph.
Fuel system · September 2019A February 2015 C200 Sport auto had a petrol odour outside, indicating a blocked charcoal filter in the fuel system's breather.
General · July 2019A 2017 C220d Estate with 19,000 miles spent 54 out of 66 days in the workshop due to repeated breakdowns.
Fuel system · May 2019A March 2016 W205 C200 had a petrol smell, caused by a blocked carbon filter in the fuel tank's ventilation system.
Electrics · February 2019A 2013 C220 CDI BlueEFFiCiENCY 7G-Tronic had ABS and EPS warning lights after a service, eventually diagnosed as a faulty EPS unit.
Electrics · January 2019A 2010 C250 Blue Efficiency experienced dashboard function failure due to a failed media interface unit, which could not be replaced.
Suspension and steering · December 2018The offside track control arm mount of a 2008 C350 Sport snapped off the subframe.
Engine · December 2018A 2012 C250 at 46,784 miles had an engine warning light for an electrical fault in the intake camshaft positioner sensor.
General · October 2018A C350e experienced high-speed vibration, particularly on motorways, which remained after tyre changes and laser alignment.
Electrics · October 2018A 2017 C350e experienced failure of its EMS and then the hybrid battery's Charge Control unit, requiring a special order part.
Engine · August 2018A 2014 C250 CDI AMG Line auto with full service history suffered a mechanical failure requiring a replacement engine.
Fuel system · August 2018A 2018 C200d Sport was delivered with a 42-litre fuel tank instead of 66 litres, which was later corrected.
Brakes · July 2018The electromechanical parking brake on a 2012 S204 C-Class estate automatic failed to secure the vehicle on a steep slope.
Gearbox and clutch · July 2018The differential failed on a 2009 C180 1.6 at 75,000 miles, with a dealer quoting £2,500 for replacement.
Electrics · June 2018The driver's side door lock failed on a 2007 W204 C220, preventing locking with the fob or interior button.
Fuel system · June 2018A 2017 C220d Premium Plus auto was delivered with a 42-litre fuel tank instead of the expected 66-litre capacity.
Engine · June 2018A 2015 C200 Sport 1.6 Bluetec diesel experienced repeated engine oil warnings, gearbox and turbocharger failures, and ultimately a complete engine failure.
Fuel system · June 2018A new C200 was delivered with a 42-litre fuel tank instead of the specified 64 litres.
Interior · May 2018A driver sliced their hand on the hard plastic coating of a 2012 C-Class coupe's seatback release lever.
Electrics · March 2018A 2017 C250d AMG Premium Plus estate developed numerous electrical faults, including door lights, memory seats, and keyless entry.
Engine · February 2018A 2009 C180 CGI with 34,000 miles developed multiple oil leaks from the filter housing, sump, and turbo lines.
Electrics · February 2018The starter motor failed on a 2013 C220 at 20,500 miles, costing the owner £350 for the repair.
Gearbox and clutch · January 2018A 2007 C230 Auto Avantgarde SE Estate with 108,000 miles had intermittent gearbox problems, diagnosed as a faulty speed sensor.
Bodywork · January 2018The tailgate of a September 2017 C220d Estate opened randomly when the car was left unattended.
Electrics · January 2018A 2017 C220 CDI AMG Line Premium plus had a Command system failure, intermittent boot sensor, and rusty brake discs.
Electrics · December 2017A 2014 C63AMG experienced an 'auto lights inoperative' warning and non-functional windscreen wipers, leading to immobilisation after a software update.
Bodywork · December 2017A persistent rattle was reported in the sunroof mechanism of a 2016 C-200, which the dealer could not cure.
Electrics · November 2017The power steering on a 2012 C180 became stiff twice due to a low battery charge, requiring two battery replacements.
Engine · October 2017A 2012 W204 C220i automatic experienced fluctuating engine revolutions when cold, making it impossible to drive.
Bodywork · September 2017Creaking from the door seals of a 2016 C200 executive auto persisted after the dealer refitted and lubricated them.
Fuel system · July 2017A 2015 C-Class with 20,000 miles emitted a petrol smell both within the cabin and from the exterior.
Electrics · May 2017The unit receiving the remote/transponder on the steering column of a 2012 C180 had a crunchy action from new.
Gearbox and clutch · December 2016A 2012 C180 CGI Blue Efficiency automatic with 27,000 miles experienced 'jumping' gearchanges, despite software and fluid changes.
Bodywork · December 2016The red paint on a 2011 C180 Coupe began showing raised pimples at 20,000 miles.
Engine · October 2016The engine of a 2012 C63AMG required replacement of all four camshafts, cam followers, and tappet adjusters, costing £6,366 after goodwill.
Engine · August 2016A 2007 C200CDI with 40,000 miles had a 'tinkling' noise from the timing chain area on start-up.
Electrics · July 2016A new March 2016 C350e refused to charge due to water ingress into the charging cable, which was replaced with a modified unit.
Interior · June 2016The glove locker on a W204 with keyless start was broken into, requiring a new lid costing £550.
Cooling · May 2016A 2012 C250CDI with 32,000 miles had two coolant leaks from the water pump and thermostat housing, costing £550 after goodwill.
Bodywork · February 2016The upper bulkhead seam of a four-year-old C-Class coupe split, causing water to leak into the passenger footwell.
Electrics · February 2016A 2011 C180 Coupe had a persistent ECO function problem, cycling on and off regularly despite multiple dealer attempts to fix it.
Engine · September 2015An oil leak from the timing chain tensioner seal of a 109,000-mile C220CDI W204 led to new valves, springs, lifters, and a turbo, costing £4,400.
Electrics · July 2015A C-Class bought in November 2014 had multiple electrical issues, including control screen failure, satnav problems, and intermittent starting.
Suspension and steering · June 2015All four Continental tyres on a 2012 C-Class coupe with 9,000 miles showed sidewall and tread cracking at its first MoT.
Suspension and steering · May 2015The steering rack failed on a five-year-old C200CDI with 27,000 miles, with replacement estimated at £2,000.
What owners like about the W204 / C-Class
17 notes
The C-Class achieved a five-star Euro NCAP rating for passenger protection, three stars for child passengers, and two for pedestrian protection.
Post-2012 facelift C-Class models with the COMAND satnav system accept seven-figure postcodes.
The C-Class estate model from 2008 to 2014 features a very neat and attractive exterior design.
This C-Class model offers a highly comfortable and refined driving experience for occupants.
The C-Class estate offers more interior room and boot space compared to its predecessor model.
The C-Class estate is expected to offer refined driving dynamics and good handling, similar to the saloon.
The C-Class estate boasts exceptional interior quality and a high standard of finish.
The dashboard and driver's area of the C-Class estate are nicely designed.
The C-Class estate features a large boot with a versatile 40/20/40 folding rear bench seat.
The four-cylinder diesel engines in the C-Class estate are superbly refined and economical.
This C-Class estate model comes with a very generous list of standard equipment.
The C-Class features a much improved interior quality compared to previous models.
The C-Class is more refined and offers a better driving experience than its predecessor.
The 1.6-litre diesel engine in the C200 Bluetec is very impressive and economical.
The C-Class is offered with a newly developed and efficient six-speed manual transmission.
The optional Airmatic suspension, costing £895, is a recommended feature for the C-Class.
The C-Class achieved a five-star Euro NCAP rating, with high scores for adult and child occupant protection.
Other years0 known faults · 1 owner report · 9 good notes
Other Mercedes-Benz C-Class years: owner reports
What owners report
1 single report, 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 · November 2019Problems with the 'Mercedes Me' app adversely affected the software functions of a new 2019 C-Class Coupe.
What owners like
9 notes
The C-Class Cabriolet's fabric hood is very well insulated, providing comfort in winter conditions.
The C-Class Cabriolet offers 4Matic all-wheel drive as an option for both petrol and diesel engines.
The C-Class Cabriolet's interior feels solid, well-finished, and modern, unlike some recent Mercedes-Benz models.
The C-Class Cabriolet's roof operates at speeds up to 30mph, allowing for quick closure in sudden downpours.
The 2017 C-Class Cabriolet achieved a five-star Euro NCAP rating, with 89% adult occupant safety.
The C 220 d is available with a manual gearbox as standard or a 9G-Tronic nine-speed automatic transmission.
The 2016 C-Class Coupe offers a firm yet forgiving ride, making it one of the most comfortable two-door cars available.
This 2016 C-Class Coupe demonstrates excellent high-speed stability and overall refinement during journeys.
The boot of the 2016 C-Class Coupe is surprisingly practical, providing ample space for a large pushchair.
Sellers rarely admit these faults outright
We track 65 specific phrases sellers use in adverts to soft-pedal these exact issues. Paste any Mercedes-Benz C-Class advert and we check it in seconds.
Mercedes-Benz C-Class service intervals: cambelt, chain and gearbox oil
An overdue cambelt is the most expensive thing a seller can fail to mention on a used C-Class. These are the figures UK specialists work to.
Timing chainChain
W204, W212, W906, 2.1 CDI, OM651
No fixed replacement interval
Rear-mounted timing chain stretches over time, typically at 100,000-150,000 km under normal maintenance. No fixed interval. The tell-tale is a cold-start rattle that disappears after 10-20 seconds. Because the chain sits at the back of the engine, replacement is a major job.
Automatic gearbox oil
7G-TRONIC, 722.9, 7 SPEED
40,000 miles or 4 years, whichever comes first
Mercedes initially claimed 'filled for life', which specialists call marketing over engineering. The recommendation is a fluid and filter change every 40,000 miles to prevent conductor plate failure, a GBP 800-1,200 repair. Some sources suggest 60,000 miles, so the shorter figure is recorded.
Automatic gearbox oil
9G-TRONIC, 725.0, 9 SPEED
60,000 miles or 6 years, whichever comes first
The published figure for the 725.0 is six years or 60,000 miles, whichever comes first. Other sources give the first factory change as roughly 60,000 km (about 37,000 miles) or 6 years, and forum consensus favours servicing at 40,000 miles, so treat 60,000 as the outer limit rather than a target.
Automatic gearbox oil
722.6, 5G-TRONIC, 5 SPEED
40,000 miles
Officially 'sealed for life' but independent specialists recommend ATF (MB 236.14 spec, which supersedes 236.10 and 236.12) and filter changes every 40,000 miles to head off valve body and conductor plate trouble. Capacity is about 7.5 litres. Fitted to most pre-2011 rear-wheel-drive Mercedes including the pre-2010 C, E and SLK.
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
Mercedes-Benz C-Class buying questions
Is a used Mercedes-Benz C-Class reliable?
The Mercedes-Benz C-Class has 23 known faults in our database across 2 generations, 15 of them rated high severity. The most serious are electrics (a broken steering column spring, coupled with insufficiently earthed wiring) and fuel system (piezo Delphi fuel injector failure leading to limp mode and severe misfires). None of them makes the car a bad buy on its own; the risk is a seller who knows and says nothing.
What are the most common Mercedes-Benz C-Class problems?
Three stand out. Electrics: a broken steering column spring, coupled with insufficiently earthed wiring. Fuel system: piezo Delphi fuel injector failure leading to limp mode and severe misfires (typically 40000 to 80000 miles). Engine: oil cooler seals fail in the 'V' of the engine causing massive oil leaks (typically 60000 to 100000 miles). The full list above is grouped by generation, with typical mileage and a rough repair cost for each.
Which Mercedes-Benz C-Class years should I avoid?
No Mercedes-Benz C-Class year is a write-off, but the W204 / C-Class (2007 to 2014) carries the most serious faults: electrics, fuel system, engine, gearbox, suspension and bodywork and trim. The W202 (1993 to 2008) has high-severity faults on record too. 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 Mercedes-Benz C-Class?
Ask the seller about the electrics, fuel system and engine faults on this page and whether they have been fixed, with invoices. On the test drive watch for airbag warning light appearing on the dashboard, engine management light and oil pooling in the engine valley. Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against all 23 known faults before you travel. Check a Mercedes-Benz C-Class advert →
What is the real MPG of a Mercedes-Benz C-Class?
Owners report 42.0 mpg on average across the Mercedes-Benz C-Class engines with data, about 84% 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 4,233 owner submissions. Mercedes-Benz C-Class Real MPG by engine →
Where this Mercedes-Benz C-Class 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 Mercedes-Benz C-Class 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.
Knowing what a Mercedes-Benz C-Class 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.