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Known Faults Database

Toyota Prius problems, reliability and years to avoid

If you are considering buying a used Toyota Prius, these are the common problems worth knowing about first. Our garage database tracks 11 known faults for this model, 9 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 Toyota Prius reliable?

The Toyota Prius has 11 known faults in our database across 3 generations, 9 of them rated high severity. The most serious are electrics (high incidence of catalytic converter theft due to the high amount of precious metals) and engine (failure of the electrically driven water pump that circulates coolant through the hybrid). 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 Toyota Prius 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.

Gen 2, 2003 to 20093 high severity
5 known faults, the serious ones in the electrics, engine
Gen 3, 2009 to 20155 high severity
5 known faults, the serious ones in the electrics, fuel system, engine
Gen 4, 2016 to 20221 high severity
1 known fault, the serious ones in the electrics

Years and engines with a serious known fault

  • 2003 to 2009, All Hybrid: high incidence of catalytic converter theft due to the high amount of precious
  • 2003 to 2009, All Hybrid: failure of the electrically driven water pump that circulates coolant through
  • 2000 to 2009, All Hybrid: damage to hybrid system circuits (potentially ECU) due to incorrect
  • 2009 to 2014, All Hybrid: software issue in the hybrid system's boost converter
  • 2015 to 2018, All Hybrid: a portion of the engine wire harness, connected to the hybrid vehicle power
  • 2011 to 2015, All Plug-in Hybrid: the Electric Vehicle (EV) fuse may malfunction if the vehicle is repeatedly

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

Generation 1 of 35 known faults · 1 owner report · 7 good notes

Toyota Prius Gen 2 (2003 to 2009) problems

ElectricalMedium severity📝 Editorial

High Voltage (HV) hybrid battery pack cellular degradation due to age and mileage

Rough guide
£800-1500

Typical symptoms

  • 'Red Triangle of Death' on dashboard
  • rapid charging and discharging on the energy monitor display
  • poor fuel economy (engine runs constantly)

Affected vehicles

Engines:
1.5 Hybrid
Typical mileage:
120000-200000 miles
2 more owner reports back this up
  • June 2018A 2006 Prius with 108,000 miles required a replacement hybrid battery, costing £1,250 plus VAT at a Toyota dealer.
  • June 2014The hybrid drive battery failed on a 10-year-old Prius, with a Toyota dealer quoting £1,400 for replacement.
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ElectricalHigh severity💬 2 owner reports, 2011

Damage to hybrid system circuits (potentially ECU) due to incorrect jump-starting procedures. Hybrids should be trickle charged, not jump started directly to the hybrid battery.

Rough guide
£1000-3000

Typical symptoms

  • Warning lights on dashboard (e.g., 'red triangle')
  • Hybrid system malfunction
  • Car fails to start or operate correctly
  • Reduced power or erratic behaviour

Affected vehicles

Engines:
All Hybrid
Typical mileage:
Any miles
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Engine/EmissionsHigh severity💬 4 owner reports, 2011 to 2015

Failure of the electrically driven water pump that circulates coolant through the hybrid components. This is a known problem that Toyota dealers look for during services.

Rough guide
£400-800

Typical symptoms

  • Warning light illuminated on the dashboard (indicating hybrid system issue)
  • Overheating of hybrid components
  • Reduced hybrid system performance

Affected vehicles

Engines:
All Hybrid
Typical mileage:
60000-100000 miles
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SecurityHigh severity💬 5 owner reports, 2018 to 2019

High incidence of catalytic converter theft due to the high amount of precious metals and ease of removal. Prius II models are particularly vulnerable.

Rough guide
£1000-2000

Typical symptoms

  • Extremely loud exhaust noise after starting
  • Engine warning light illuminated
  • Car fails MOT due to emissions

Affected vehicles

Engines:
All Hybrid
Typical mileage:
Any miles
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SteeringMedium severity💬 3 owner reports, 2014 to 2018

The 'Top Intermediate' steering column shafts of early Prius models are prone to failure, causing a knocking noise. A modified part was released, but some cars may have slipped through recall actions.

Rough guide
£300-600

Typical symptoms

  • Tapping or knocking noise from the steering column
  • Noise stops or changes when steering wheel is turned left or right over bumps
  • Loose feeling in the steering

Affected vehicles

Engines:
All
Typical mileage:
40000-80000 miles
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What owners report on the Gen 2

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.

  • Suspension and steering · May 2012A 2005 Prius with 48,000 miles experienced a power steering system failure, with a repair bill of £1,274.

What owners like about the Gen 2

7 notes
  • February 2018A 2008 Prius 1.5 T-Spirit maintained good fuel economy over seven years, averaging 49mpg in city driving.
  • The car achieved a 5-star NCAP occupant safety rating, alongside 2 stars for pedestrian protection.
  • The model received high satisfaction scores in the 2008 UK Customer Satisfaction Index Study, particularly for quality and reliability.
  • Prius taxis have achieved over 400,000 miles with minimal issues, attributed to the Atkinson cycle engine and simple drivetrain.
  • The November 2003 model offered improved size, speed, fuel efficiency, and reduced emissions, with an excellent digital instrument layout.
  • Improvements from May 2005 included better ride, handling, and reduced noise, vibration, and harshness.
  • The 2006 model received adjustments to the rear hip point, new upholstery colours, and a soft-touch dashboard finish.
End of the Gen 2 section.Pick another year ↑Check a Toyota Prius advert →
Generation 2 of 35 known faults · 7 owner reports · 2 good notes

Toyota Prius Gen 3 (2009 to 2015) problems

Engine/EmissionsHigh severity📝 Editorial

EGR cooler blockage leading to localized overheating and head gasket failure

Rough guide
£1200-2500

Typical symptoms

  • loud metallic 'death rattle' or shaking on cold start
  • unexplained coolant loss
  • misfire fault codes (P0300 series)

Affected vehicles

Engines:
1.8 Hybrid (2ZR-FXE)
Typical mileage:
100000-150000 miles
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ElectricalHigh severity🏛️ Official recall

Intelligent Power Module (IPM) inside the inverter fails, causing the hybrid system to shut down

Rough guide
£2000-3000

Typical symptoms

  • 'Check Hybrid System' warning on dash
  • sudden loss of motive power while driving
  • car enters limp mode

Affected vehicles

Engines:
1.8 Hybrid
Typical mileage:
80000-150000 miles
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ElectricalHigh severity💬 2 owner reports, 2014 to 2018

Software issue in the hybrid system's boost converter, part of the inverter assembly, leading to higher thermal stress and potential loss of motive power. This was subject to a recall.

Rough guide
£0 (free recall software update)

Typical symptoms

  • Warning lights and messages illuminate
  • Reduced power or complete loss of motive power
  • Hybrid system shuts down

Affected vehicles

Engines:
All Hybrid
Typical mileage:
Any miles
1 more owner report backs this up
  • February 2018A 2013 Prius experienced a 5 miles per gallon drop in city fuel economy after a recall fix for its hybrid electrical system.
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Fuel SystemHigh severity💬 1 owner report, 2016

A crack can develop in the resin channel of the fuel evaporative emission control unit (canister) assembled to the fuel tank. This crack can expand over time, leading to fuel leakage when the tank is full, posing a fire risk. This was subject to a recall.

Rough guide
£0 (free recall repair)

Typical symptoms

  • Smell of fuel, especially when the tank is full
  • Visible fuel leak under the car
  • Fuel warning lights

Affected vehicles

Engines:
All Hybrid
Typical mileage:
Any miles
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ElectricalHigh severity💬 2 owner reports, 2017

The Electric Vehicle (EV) fuse may malfunction if the vehicle is repeatedly operated by the electric motor under high-load driving conditions (e.g., long hill climbs). This can lead to warning lights, reduced power, or loss of motive power. This was subject to a recall.

Rough guide
£0 (free recall repair)

Typical symptoms

  • Warning lights and messages illuminate on the dashboard
  • Reduced power in EV mode
  • Hybrid system could shut down, resulting in loss of motive power

Affected vehicles

Engines:
All Plug-in Hybrid
Typical mileage:
Any miles
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What owners report on the Gen 3

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.

  • Exhaust · October 2019A Toyota Prius experienced catalytic converter theft twice, once from a car park and again from outside the owner's home.
  • Exhaust · September 2019There is a reported shortage of replacement catalytic converters and protective clamps for Toyota models.
  • Exhaust · July 2019A 2010 Toyota Prius 3 had its catalytic converter stolen, highlighting the need for protective devices.
  • Brakes · February 2016A 2012 Prius was reported to have corroded rear brake discs, with the dealer recommending replacement of discs and pads.
  • Electrics · August 2015A Toyota sat-nav with Software Version 2.8.4al gave incorrect directions in the UK, France, or Spain, requiring a free software upgrade.
  • Brakes · July 2015A five-year-old Prius had a brake actuator fault (code C1214) that cost £2,757 to repair at a Toyota dealer.
  • Electrics · March 2015A November 2014 Prius Plug-in experienced a decrease in EV range, dropping from 11.2 to 9 miles in four months.

What owners like about the Gen 3

2 notes
  • The car achieved a 5-Star NCAP Crash Safety score, with high percentages for adult, child, and pedestrian protection.
  • The Prius III model is less susceptible to catalytic converter theft due to lower precious metal content and harder access.
End of the Gen 3 section.Pick another year ↑Check a Toyota Prius advert →
Generation 3 of 31 known fault · 5 good notes

Toyota Prius Gen 4 (2016 to 2022) problems

ElectricalHigh severity💬 2 owner reports, 2018

A portion of the engine wire harness, connected to the hybrid vehicle power control unit, may lack a protector and contact the connector cover. This can cause wear over time, potentially leading to an electrical short circuit. This was subject to a recall.

Rough guide
£0 (free recall repair)

Typical symptoms

  • Warning lights on dashboard
  • Loss of motive power
  • Engine stalling

Affected vehicles

Engines:
All Hybrid
Typical mileage:
Any miles
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What owners like about the Gen 4

5 notes
  • The 2016 model achieved a five-star Euro NCAP rating, with high scores for adult, child, and pedestrian safety.
  • This 2016 Prius offers a generous level of standard equipment, including advanced driver assistance features like adaptive cruise control and road sign recognition.
  • The cabin is spacious, providing ample room for four adults to travel comfortably.
  • The car is exceptionally easy and relaxing to drive, contributing to a pleasant driving experience.
  • This model has a towing capacity of 725kg, suitable for pulling small trailers or micro caravans.
End of the Gen 4 section.Pick another year ↑Check a Toyota Prius advert →

Sellers rarely admit these faults outright

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Toyota Prius recalls

Recall work is done by the manufacturer, and GOV.UK says you will not usually have to pay for it. These are the 21 DVSA recalls for the Prius, 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.

🏛️ March 2026Cars built February 2023 to November 2025

Relay and Wire Harness installation on certain Prius

For affected vehicles that are equipped with an electric rear door lock system which includes a door opener switch and a rear door lock release actuator If the seal performance for this switch is reduced this can temporarily allow water to enter the switch which can cause the switch to activate and the door could open unexpectedly.

Put right by: Installation of relay and wire harness.

DVSA R/2026/0272,235 vehicles affected in the UK
🏛️ October 2021Cars built May 2021 to July 2021

Incorrect programming in relation to transmission shift position status might cause hybrid system to shut down

Due to incorrect programming the hybrid vehicle ECU can incorrectly determine that the validation signal is erroneous for the shifter position

Put right by: Reprogram the Hybrid ECU.

DVSA R/2021/33296 vehicles affected in the UK
🏛️ August 2021Cars built August 2020 to May 2021

The pre-crash brake assist function can be delayed

The pre-crash brake assist function can be delayed.

Put right by: Reprogram the Brake booster assembly with master cylinder ECU.

DVSA R/2021/260540 vehicles affected in the UK
🏛️ July 2020Cars built February 2014 to November 2015

Under certain circumstances the hybrid unit may shut down and cause loss of motive power

Under certain circumstances the hybrid unit may shut down and cause loss of motive power.

Put right by: Reprogram the Power Management ECU.

DVSA R/2020/19055,724 vehicles affected in the UK
🏛️ March 2020Cars built November 2015 to January 2018

Improper assembly of the electrical contacts in the driver's seat belt reminder switch

An improper assembly of the electrical contacts in the reminder switch for the driver seat belt

Put right by: Replace driver side seat inner belt.

DVSA R/2020/02511,670 vehicles affected in the UK
🏛️ January 2020Cars built July 2019 to July 2019

An electrical short circuit in the combination meter could occur

An electrical short circuit in the combination meter could occur.

Put right by: Inspect and replace the meter circuit plate based on the inspection result

DVSA R/2019/440148 vehicles affected in the UK
🏛️ November 2019Cars built April 2019 to June 2019

Brake booster pump may stop working

An electrical connection within the motor may cause the brake booster pump to stop operating

Put right by: Inspect and replace the brake booster pump assembly if necessary.

DVSA R/2019/2482,146 vehicles affected in the UK
🏛️ November 2019Cars built December 2015 to October 2018

Incorrectly installed covers could prevent the seat-mounted side airbag from deploying

Incorrectly installed covers could prevent the seat-mounted side air bag from deploying properly.

Put right by: Inspect the covers installed on the front seats and replace any incorrectly installed covers

DVSA R/2019/3333,887 vehicles affected in the UK
🏛️ January 2019Cars built October 2008 to November 2014

Vehicle may not enter failsafe driving mode as intended in response to certain hybrid system faults

The vehicle may not enter a failsafe driving mode as intended.

Put right by: Reprogram the Power Management ECU.

DVSA R/2018/293111,038 vehicles affected in the UK
🏛️ October 2018Cars built July 2015 to May 2018

Engine wire harness connected to hybrid vehicle power control unit could contact cover

Due to assembly variation a portion of the engine wire harness could contact the cover.Should the insulation wear and the core wires become exposed there is an increased risk of a vehicle fire.

Put right by: Inspect the engine wire harness and repair or replace it if necessary.

DVSA R/2018/24032,393 vehicles affected in the UK
🏛️ December 2017Cars built January 2016 to December 2016

Invertor capacitor may not be secure

The hybrid system of the subject vehicles includes an inverter assembly which contains a capacitor that may not have been properly bolted to the inverter housing. In this condition the terminal of the capacitor could be damaged by vibration during normal vehicle operation.

Put right by: On affected vehicles replace the invertor assembly

DVSA R/2017/2863 vehicles affected in the UK
🏛️ December 2017Cars built April 2012 to January 2015

The electric vehicle (EV) fuse may malfunction

The Electric Vehicle (EV) fuse which may malfunction if the vehicle isrepeatedly operated by the electric motor under high-load driving conditions such as during a long hill climb. If the fuse malfunctions warning lights and warning messages will illuminate. In some cases the vehicle can be driven but with reduced power. In other cases the hybrid system could shut down resulting in the loss of motive power.

Put right by: On affected vehicles replace the fuse.

DVSA R/2017/3091,399 vehicles affected in the UK
🏛️ November 2016Cars built December 2015 to June 2016

Airbag may incorrectly deploy

The passenger air bag inflator may have been incorrectly manufactured/assembled. This may allow leakage of compressed gas and partial inflation of the airbag without a deployment command.

Put right by: Replace passenger airbag unit.

DVSA R/2016/213691 vehicles affected in the UK
🏛️ November 2016Cars built August 2015 to October 2016

Parking brake may fail

The subject vehicles are equipped with a foot-operated parking brake system containing a parking brake cable and a crank lever which upon activation transmit the force of the parking brake pedal to the brake caliper piston. Over time during normal operation of the vehicle the cable could disengage at the pedal end causing the parking brake to become inoperative.

Put right by: Recall the vehicles that are likely to be affected to fit retaining clips for the cable.

DVSA R/2016/2374,617 vehicles affected in the UK
🏛️ September 2016Cars built October 2008 to February 2015

Fuel may leak / risk of fire

The vehicles are equipped with a fuel evaporative emission control unit (canister) assembled to the fuel tank. There is a possibility that a crack could develop on the resin channel for the emission gas flow due to an improper shape of the channel edge at that location. The crack could expand over time and eventually fuel may leak from the crack when the vehicle has a full tank. Fuel or fuel vapour in the presence of an ignition source could increase the risk of a vehicle fire

Put right by: Recall the vehicles that are likely to be affected and replace the fuel suction plate sub-assembly.

DVSA R/2016/15272,891 vehicles affected in the UK
🏛️ September 2016Cars built October 2008 to April 2012

Curtain shield airbag may deploy unintentionally

On affected vehicles the curtain side air bag inflator may have a crack in a weld. If this crack propagates gas may leak and in certain conditions partially in inflate the air bag.

Put right by: On affected vehicles install retention brackets on the curtain shield air bag inflators.

DVSA R/2016/15334,135 vehicles affected in the UK
🏛️ August 2015Cars built November 2011 to November 2014

Loss of power

The inverter assembly may overheat which will cause warning lamps to illuminate and the vehicle to enter a fail safe mode. Fail safe allows the vehicle to be driven on reduced power to a place of safety. However it is possible for the hybrid system to shut down causing the vehicle to stop which increases the risk of a collision.

Put right by: On affected vehicles reprogramme the Motor Generator and Power Management ECUs.

DVSA R/2015/15249,468 vehicles affected in the UK
🏛️ March 2014Cars built March 2009 to February 2014

Loss of power may occur

In certain circumstances components within the inverter assembly may overheat which can lead to the selection of: fail safe mode where the vehicle can still drive with reduced power for a certain distance or in the worst case the drive systems shut down and the vehicle stop.

Put right by: Recall the vehicles that are likely to be affected to reprogramme the Motor Generator E.C.U. and Power Management Control E.C.U.

DVSA R/2014/02430,788 vehicles affected in the UK
🏛️ July 2013Cars built October 2008 to October 2009

Braking efficiency may be affected

The subject vehicles are equipped with brake pressure accumulators consisting of a metal plunger containing brake fluid encased in a metal housing. The plunger is designed with metal pleated bellows to allow for motion. Nitrogen gas is sealed between the plunger and housing. It is possible that a fatigue crack could develop in the bellows due to vertical vibration of the plunger while driving. If this occurs nitrogen gas could leak into the brake fluid and gradually cause the brake pedal stroke to become longer resulting in decreased hydraulic pressure which could result in increased stopping distance.

Put right by: Recall the vehicles that are likely to be affected to first check which type of brake booster is fitted and if the at risk type is fitted; replace the brake booster assembly with an improved one.

DVSA R/2013/0709,882 vehicles affected in the UK
🏛️ December 2012Cars built June 2003 to March 2009

Loss of steering

It is possible that the splines of the extension shaft on vehicles equipped with Electric Motor assisted Power Steering (EMPS) may not have received the correct hardness treatment. This can cause the spline to distort and wear and eventually result in loss of steering.

Put right by: Recall affected vehicles check and if necessary replace the shaft.

DVSA R/2012/14561,910 vehicles affected in the UK
🏛️ December 2012Cars built July 2003 to March 2009

Short circuit may occur

In the Hybrid system of the subject vehicles there is an electrically driven water pump assembly that circulates coolant through the hybrid components. It is possible the coil wire of the electric motor installed in the water pump may have been scratched during the coiling manufacturing process at the supplier. In this condition the coil wire may corrode at the scratched portion and in some cases break. If this occurs the water pump could stop working leading to illumination of various warning lights in the instrument panel. In some cases a short circuit occurs between adjacent coil wires resulting in a blown fuse for the electric power supply circuit. This will cause the hybrid system to stop while the vehicle is being driven which increases the risk of an accident.

Put right by: Replace the HV Electric Water Pump

DVSA R/2012/14652,503 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.

Toyota Prius timing chain, and service intervals

A timing chain has no change interval, which is not the same as lasting for ever. Listen for it on a used Prius, and check the oil has been changed on time. These are the figures UK specialists work to.

Timing chainChain
1.8 HYBRID, 2ZR-FXE
No fixed replacement interval

The 1.8 hybrid (2ZR-FXE) is chain driven and famously durable, with no scheduled replacement interval. Wear follows neglected oil rather than mileage and failure is exceptionally rare. This engine family's known issue is EGR cooler blockage, which can cause head gasket failure, not the timing gear.

Hybrid transaxle (eCVT) fluid
60,000 miles

Toyota officially treats the WS transaxle fluid as sealed for life with inspection only and no scheduled change, but Toyota dealers and hybrid specialists both recommend a proactive drain and fill at 60,000 miles, within a 60,000-100,000 mile range, roughly halved for taxi or heavy stop-start use. It is about 4 litres of Toyota WS fluid and is cheap insurance for the motor-generators on a high-mileage hybrid. The absence of any fluid change on a 100,000-mile-plus example is worth noting, not treating as a fault.

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

Toyota Prius buying questions

What are the most common Toyota Prius problems?

Three stand out. Electrics: high incidence of catalytic converter theft due to the high amount of precious metals. Engine: failure of the electrically driven water pump that circulates coolant through the hybrid components (typically 60000 to 100000 miles). Electrics: damage to hybrid system circuits (potentially ECU) due to incorrect jump-starting procedures. The full list above is grouped by generation, with typical mileage and a rough repair cost for each.

Which Toyota Prius years should I avoid?

No Toyota Prius year is a write-off, but the Gen 3 (2009 to 2015) carries the most serious faults: electrics, fuel system and engine. The Gen 2 (2003 to 2009) and Gen 4 (2016 to 2022) have 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 Toyota Prius?

Ask the seller about the electrics and engine faults on this page and whether they have been fixed, with invoices. On the test drive watch for extremely loud exhaust noise after starting, warning light illuminated on the dashboard (indicating hybrid system issue) and warning lights on dashboard (e.g., 'red triangle'). Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against all 11 known faults before you travel. Check a Toyota Prius advert →

Are there any recalls on the Toyota Prius?

The DVSA lists 21 safety recalls for the Toyota Prius issued between 2012 and 2026. The most recent, from March 2026, is "Relay and Wire Harness installation on certain Prius". 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 a Toyota Prius?

Owners report 59.5 mpg on average across the Toyota Prius engines with data, about 70% 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 1,346 owner submissions. Toyota Prius Real MPG by engine →

Looking at a Toyota Prius right now? Check the advert before you go and see it.

Where this Toyota Prius 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 Toyota Prius 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 Toyota Prius 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
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