Faults by part: what fails on each engine and car
Choose the part (the turbo, the EGR valve, the timing belt, the shock absorbers, the electric handbrake, the airbags…) and we show you every fault documented on the engines and cars we analyse: symptoms, how much they cost to repair and which models are affected.
Engine
Timing drive, turbo, injection, emissions control, lubrication, cooling and ignition.
- Timing belt29 faults · 29 engines · 198 affected modelsCritical severityGarage: €400–€1,500
- Timing chain46 faults · 45 engines · 263 affected modelsCritical severityGarage: €350–€7,000
- Variable valve timing (VVT) actuator11 faults · 11 engines · 51 affected modelsCritical severity
- Turbo60 faults · 60 engines · 354 affected modelsCritical severityGarage: €150–€3,000
- EGR valve60 faults · 58 engines · 375 affected modelsCritical severityGarage: €60–€2,500
- Particulate filter (DPF/FAP)38 faults · 37 engines · 262 affected modelsHigh severityGarage: €100–€3,000
- AdBlue (SCR) system and NOx sensor18 faults · 18 engines · 130 affected modelsMedium severityGarage: €100–€2,000
- Injectors56 faults · 52 engines · 377 affected modelsCritical severityGarage: €80–€5,900
- Fuel pump and high-pressure pump24 faults · 24 engines · 188 affected modelsCritical severityGarage: €250–€2,000
- Oil consumption47 faults · 45 engines · 261 affected modelsCritical severityGarage: €900–€4,000
- Oil leaks27 faults · 23 engines · 113 affected modelsCritical severityGarage: €200–€2,200
- Water pump37 faults · 37 engines · 220 affected modelsCritical severityGarage: €300–€1,500
- Thermostat and cooling system38 faults · 34 engines · 241 affected modelsCritical severityGarage: €300–€760
- Head gasket13 faults · 12 engines · 77 affected modelsCritical severity
- Ignition coils and spark plugs30 faults · 30 engines · 152 affected modelsHigh severityGarage: €120–€600
- Carbon build-up in the intake24 faults · 24 engines · 191 affected modelsMedium severityGarage: €110–€310
- Intake flaps (swirl flaps)8 faults · 8 engines · 63 affected modelsCritical severityGarage: €600–€1,200
- Engine sensors22 faults · 22 engines · 121 affected modelsHigh severityGarage: €800–€3,000
- Big-end bearings and pistons12 faults · 11 engines · 94 affected modelsCritical severity
- Crankshaft pulley and engine mounts5 faults · 5 engines · 48 affected modelsHigh severity
- Hybrid system45 faults · 8 engines · 63 affected modelsCritical severity
- High-voltage battery (hybrids and EVs)35 faults · 3 engines · 42 affected modelsCritical severity
Gearbox, clutch and transmission
Manual, automatic, dual-clutch and automated gearboxes, clutch and dual-mass flywheel.
- Clutch183 faults · 27 engines and gearboxes · 276 affected modelsHigh severityGarage: €340–€4,000
- Dual-mass flywheel63 faults · 20 engines and gearboxes · 181 affected modelsHigh severityGarage: €340–€4,000
- Dual-clutch gearbox (DSG, EDC, PowerShift...)60 faults · 7 gearboxes · 112 affected modelsCritical severityGarage: €450–€3,100
- Automatic gearbox (torque converter and CVT)74 faults · 12 engines and gearboxes · 126 affected modelsCritical severityGarage: €120–€2,000
- Automated manual gearbox (Dualogic, Easytronic, MMT...)23 faults · 5 engines and gearboxes · 50 affected modelsCritical severity
- Gearbox mechatronic unit13 faults · 12 gearboxes · 147 affected modelsHigh severityGarage: €600–€3,100
- Manual gearbox89 faults · 10 engines and gearboxes · 154 affected modelsCritical severityGarage: €340–€4,000
- Driveshafts, propshaft and four-wheel drive44 faults · 1 engine · 45 affected modelsCritical severity
Suspension, steering, brakes and wheels
Shock absorbers, control arms and ball joints, power steering, brake servo, ABS and tyres.
- Shock absorbers and top mounts90 faults · 89 affected modelsCritical severityGarage: €700
- Air and hydropneumatic suspension25 faults · 25 affected modelsCritical severity
- Suspension springs23 faults · 23 affected modelsCritical severityGarage: €400–€750
- Control arms, ball joints, bushes and drop links149 faults · 143 affected modelsCritical severityGarage: €300–€750
- Wheel bearings and hubs51 faults · 51 affected modelsCritical severity
- Rear axle32 faults · 32 affected modelsCritical severity
- Handbrake and parking brake66 faults · 65 affected modelsCritical severityGarage: €250–€550
- Brake servo and vacuum pump59 faults · 2 engines · 72 affected modelsCritical severity
- Brake calipers, discs and pads70 faults · 70 affected modelsCritical severity
- Brake pedal, hoses and brake fluid52 faults · 49 affected modelsCritical severity
- ABS and stability control (ESP)73 faults · 72 affected modelsCritical severityGarage: €200–€2,100
- Power steering83 faults · 81 affected modelsCritical severityGarage: €850
- Steering rack and steering column90 faults · 86 affected modelsCritical severityGarage: €850
- Tyres, wheels and wheel bolts51 faults · 50 affected modelsCritical severityGarage: €650–€750
Electrics and electronics
Batteries, alternator, wiring, control units, infotainment and driver assistance systems.
- 12 V battery70 faults · 3 engines · 76 affected modelsCritical severityGarage: €400–€500
- Alternator and starter motor50 faults · 2 engines · 56 affected modelsCritical severity
- Wiring, connectors and short circuits93 faults · 11 engines · 130 affected modelsCritical severity
- Window regulators and central locking113 faults · 110 affected modelsCritical severityGarage: €150–€250
- Headlights and lights46 faults · 44 affected modelsHigh severity
- Screen and infotainment system144 faults · 143 affected modelsHigh severityGarage: €350–€700
- Instrument cluster25 faults · 25 affected modelsHigh severity
- Driver assistance and automatic emergency braking65 faults · 61 affected modelsCritical severity
- Control units and comfort electronics (BSI, SAM...)38 faults · 36 affected modelsCritical severityGarage: €600–€800
- eCall system24 faults · 23 affected modelsCritical severityGarage: €0
Climate control, bodywork and interior
Air conditioning, heating, water leaks, paintwork, rust and panoramic roof.
- Air conditioning62 faults · 62 affected modelsCritical severityGarage: €170–€1,100
- Heating and heat pump20 faults · 20 affected modelsCritical severity
- Water leaks50 faults · 49 affected modelsCritical severity
- Paintwork, rust and corrosion67 faults · 66 affected modelsCritical severity
- Sunroof and panoramic roof30 faults · 30 affected modelsHigh severity
- Tailgate, bonnet and bodywork parts50 faults · 50 affected modelsCritical severity
- Seats and interior36 faults · 35 affected modelsCritical severity
Airbags and safety
Airbags, seatbelts, fire risk and fuel leaks.
- Airbags180 faults · 165 affected modelsCritical severity
- Takata airbags47 faults · 47 affected modelsCritical severity
- Seat belts63 faults · 60 affected modelsCritical severity
- Fire risk89 faults · 12 engines · 113 affected modelsCritical severityGarage: €500–€1,500
- Fuel leaks22 faults · 10 engines · 60 affected modelsCritical severity
- Accelerator pedal5 faults · 1 engine · 7 affected modelsCritical severity
Prefer to start with what you notice? Search by symptom (a warning light, a noise, smoke) or describe the problem in the diagnosis.