Un code est un indice. Pas un verdict.
Décoder plusieurs codes, conserver leurs relations et commencer un diagnostic adapté au véhicule.
Un code identifie une condition surveillée, pas automatiquement une pièce défectueuse.
Guides de codes révisés
P0300Random or multiple-cylinder misfire detectedEngine · Urgent if the check-engine light flashesP0301Cylinder 1 misfire detectedEngine · Urgent if flashing or running severely roughP0171System too lean — bank 1Fuel & air · Service soon; urgent with misfire or power lossP0420Catalyst system efficiency below threshold — bank 1Emissions · Service soonP0442EVAP system small leak detectedEvaporative emissions · Usually safe to schedule unless fuel odor or liquid leakage is presentP0455EVAP system large leak detectedEvaporative emissions · Schedule promptly; stop for liquid fuel leakageP0128Coolant thermostat temperature below regulating temperatureCooling · Service soon; stop if actual overheating occursP0562System voltage lowElectrical · Urgent if stalling, steering, brake, or multiple system warnings occurP0700Transmission control system requested warning lampTransmission · Depends on shifting behavior; avoid driving if slipping or engagement is unsafeP0135Oxygen sensor heater circuit fault — bank 1 sensor 1Emissions electrical · Service soon