What car do you have?
Choose your car and we will tell you what faults its engine has, from how many kilometres they appear, how much they cost to fix and how to avoid them. Everything with sources.
Find your car
Make, model, year and engine: we take you to its known faults.
Or go straight to the engine: 1.2 PureTech, 1.0 PureTech, 1.5 BlueHDi, 1.6 HDi, 1.2 and 1.4 TSI, 1.0 TSI / 1.5 TSI · See the 168
- documented cars
- 658 documented cars
- engines and gearboxes
- 168 engines and gearboxes
- sourced faults
- 3016 sourced faults
- cited sources
- 2070 cited sources
Reliability score from 0 to 10 for the 317 cars analysed in depth. Reviewed on 9 October 2026.
Has a warning light come on?
All warning lightsA noise, a warning light, smoke? Tell us
Describe it in your own words or by voice and we will tell you which known faults fit and how urgent it is.
The most searched-for faults
- Critical severityVery frequentFrequency: Very frequent1.2 PureTechOil-bath timing belt degradationThe oil-bath belt on the 1.2 PureTech (2012-2025) can swell and shed debris that blocks the oil pump pick-up; without lubrication, the engine can be destroyed. Stellantis covers it up to 10 years or 180,000 km and asks for it to be changed every 100,000 km or 6 years.Repair (garage): €400–€800
- Critical severityVery frequentFrequency: Very frequent1.5 BlueHDiWear and breakage of the 7 mm chain between the camshaftsIn 1.5 BlueHDi engines built between October 2017 and January 2023, the 7 mm chain linking the camshafts can stretch and break, causing serious engine damage. Stellantis has recalled them and covers the fault for 10 years or 240,000 km.Repair (garage): €730–€820
- Critical severityVery frequentFrequency: Very frequent1.2 and 1.4 TSITiming chain stretch and tensioner failure (EA111)On the 1.2 and 1.4 TSI EA111 (2006-2015) the chain can stretch and the tensioner fall short; if the chain jumps a tooth, the valves hit the pistons. Volkswagen admitted the defect in 2012 and revised the chain and tensioner between 2010 and 2011.Repair (garage): €700–€1,400Appears at around 30,000 km
- Critical severityVery frequentFrequency: Very frequentBMW N47Rear timing chain stretch and breakageYes: the N47 has its timing chain at the rear of the engine, next to the gearbox, and on a very high proportion of units, especially those built between 2007 and 2009, it stretches or breaks prematurely because of an inadequate tensioner, with a risk of destroying the engine.Repair (garage): €1,590–€3,000Appears at around 50,000 km
- Critical severityVery frequentFrequency: Very frequentOM651Timing chain stretch and tensioner failureYes: the OM651 timing chain can stretch prematurely, above all on units built up to 2013, and in 2014-2015 Mercedes-Benz recalled around 114,000 vehicles in Germany over a defective sealing ring in the tensioner. A metallic rattle on a cold start is the first sign.Repair (garage): €2,000–€3,500Appears at around 120,000 km
- Critical severityVery frequentFrequency: Very frequentBMW B47EGR cooler leaks with risk of engine fireYes: the EGR valve cooler can suffer internal coolant leaks which, mixed with soot and oil, can reach combustion temperatures; BMW has launched several technical campaigns since 2018 to inspect and replace it because of the risk of engine fire.Repair (garage): €500–€1,500
Least reliable engines
According to our risk index, which weights the severity and frequency of their documented faults.
- 11.2 PureTechPeugeot, Citroën, DS, Opel, Fiat, Jeep, Alfa Romeo, Lancia and ToyotaCritical severity96
- 2OM651Mercedes-Benz and InfinitiCritical severity89
- 3BMW N47BMW and MINICritical severity87
- 4BMW N57BMWCritical severity87
- 52.0 Ingenium diéselLand Rover and JaguarCritical severity87
- 61.2 and 1.4 TSIVolkswagen, Seat, Škoda and AudiCritical severity84
More rankings
- Most reliable enginesThose that give the fewest serious problems among those analysed.
- Most reliable diesel enginesThe diesels analysed, from lowest to highest risk.
- Most reliable brandsAverage score of each brand’s analysed models.
- Wet timing belt enginesWhich engines use it and what risks it carries.
- Most expensive repairsThe faults that cost the most to fix.
- Compare two enginesFaults, versions and verdict, side by side.
Cars: the least and most reliable
Adding up their engines and their suspension, brake, electronics and rest-of-car faults.
Faults by part
Turbo, EGR valve, clutch, brakes, electronics… Which engines and cars fail on each part and how much it costs to repair.
- Clutch183
- Airbags180
- Control arms, ball joints, bushes and drop links149
- Screen and infotainment system144
- Window regulators and central locking113
- Wiring, connectors and short circuits93
- Shock absorbers and top mounts90
- Steering rack and steering column90
- Manual gearbox89
- Fire risk89
- Power steering83
- Automatic gearbox (torque converter and CVT)74
- ABS and stability control (ESP)73
- Brake calipers, discs and pads70
- 12 V battery70
- Paintwork, rust and corrosion67
- Handbrake and parking brake66
- Driver assistance and automatic emergency braking65
- All parts
Latest recalls
- Fiat Grande PandaKBA 16906R: warning lights that may not illuminate (500e and Panda)
- Audi Q3 IWorldwide recall for steering bolt corrosion
- Audi Q3 IIWorldwide recall over corrosion of the steering bolt
- Fiat Doblò IIIBody control module update for instrument cluster display fault
- Seat AtecaRecall for corrosion of the steering rack bolt
Most searched-for fault codes
Got a code from the reader or the garage? What it means, causes and whether you can keep driving.
- P0299Turbo underboost (insufficient pressure)
- P0420Catalytic converter efficiency below threshold (bank 1)
- P0401Insufficient EGR flow
- P0087Fuel rail or fuel pressure too low
- P0380Glow plug circuit fault
- P0234Excessive turbo pressure (overboost)
- P0101Air flow meter (MAF): signal outside expected range
- P0171Mixture too lean (bank 1)
- P2002Low particulate filter (DPF) efficiency
- P0113Intake air temperature sensor: high signal
- P0300Misfires on multiple cylinders
- P2263Boost system performance
What’s wrong with your car?
Start with what you notice and we will tell you which faults cause it.
- Less power
- Engine warning light
- Suspension knocks
- Screen failure
- Slipping clutch
- Electronic warnings
- Window/lock failure
- Jerking
- Gears will not engage
- Vibrations
- Battery goes flat
- Heavy steering
- Engine stalls
- Gearbox noise
- Limp mode
- Hard to start
- Uses oil
- Airbag light
- Chain noise
- Hard brake pedal
- ABS/ESP light
- Coolant level drops
- Uneven wear
- Clutch pedal
- All symptoms
Faults by brand
- Abarth2
- Alfa Romeo10
- Audi32
- BMW38
- Chrysler4
- Citroën30
- Cupra4
- Dacia13
- Dodge1
- DS6
- Fiat21
- Ford34
- Honda12
- Hyundai26
- Infiniti1
- Iveco3
- Jaguar4
- Jeep8
- Kia24
- Lancia5
- Land Rover6
- Lexus3
- Lotus2
- Mazda20
- Mercedes-Benz47
- MG8
- MINI7
- Mitsubishi6
- Nissan20
- Opel26
- Peugeot34
- Polestar1
- Porsche1
- Renault40
- Rover3
- Seat16
- Škoda19
- Smart3
- Subaru7
- Suzuki13
- Tesla4
- Toyota35
- Volkswagen34
- Volvo25
Why you can trust MotorFiable
Every figure, with its source
Every figure links to the publication it comes from: manufacturers, official bodies and the specialist press.
If we don’t know, we say so
We do not fill gaps with assumptions. When a reliable figure is missing, the page says so.
Reviewed and dated
Every page shows when it was last reviewed. We correct the errors you report to us.