P0442 means the engine control unit has detected a small leak in the evaporative emission control system. This system captures fuel vapours from the tank and routes them to the engine to be burned. A small leak allows vapours to escape, increasing hydrocarbon emissions.
P0442 means the engine control unit has detected a small leak in the evaporative emission control system. This system captures fuel vapours from the tank and routes them to the engine to be burned. A small leak allows vapours to escape, increasing hydrocarbon emissions.
P0442 est un code defaut lie a systeme evap, classe en gravite low. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0442 et allume le voyant moteur.
Si ton vehicule a declenche P0442, tu peux remarquer un ou plusieurs de ces symptomes :
Voici les causes les plus courantes de P0442, classees selon la probabilite qu'elles soient en cause :
En general oui, pour des trajets courts. A small EVAP leak does not affect engine performance or safety. You can drive normally, but repair before your next emissions inspection. A loose fuel cap is the most common cause.
Suis ces etapes pour identifier la cause profonde de P0442 :
Les couts de reparation de P0442 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
P0442 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :
2003-2024
The Golf Mk5 and Mk6 have a known issue with the N80 purge valve sticking, which can trigger P0442. The EVAP hoses routed under the vehicle near the fuel tank are also susceptible to damage from road debris. VW fuel caps use a bayonet-style lock that must be turned until it clicks.
Couts estimes pour les proprietaires de Volkswagen Golfajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Volkswagen
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2006-2024
BMW vehicles use a leak detection pump (LDP) to test the EVAP system. A failing LDP can falsely trigger P0442 even when there is no actual leak. The fuel tank vent valve on E90 models is also a known failure point. BMW caps are capless on some newer models.
Couts estimes pour les proprietaires de BMW 3 Seriesajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a BMW
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2005-2022
The Focus uses a vacuum-based EVAP monitoring system. The purge valve on the 1.6 Ti-VCT and 2.0 GDI engines is mounted on the intake manifold and can develop carbon buildup causing it to stick. The fuel cap on European models is a standard screw-type.
2006-2024
P0442 on the Yaris is most commonly caused by a worn fuel cap seal, as the cap is a simple screw-type design. The EVAP system on Toyota vehicles is very reliable and rarely develops hose or canister issues. A new cap almost always resolves the code.
Couts estimes pour les proprietaires de Toyota Yarisajuste a la baisse par rapport a la moyenne en raison du prix des pieces specifiques a Toyota
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
Ces codes apparaissent souvent avec P0442 ou indiquent des problemes connexes :
Yes. A loose, cracked, or missing fuel cap is the most common cause of P0442. The EVAP system is sealed, and even a slight gap at the cap allows vapours to escape. Always tighten the cap until you hear it click and replace it if the seal is worn.
Both indicate EVAP system leaks, but P0442 is a small leak (less than about 1mm equivalent orifice) while P0455 is a large leak. Small leaks are often from deteriorated hoses or a worn cap seal. Large leaks suggest a disconnected hose or missing cap.
If the cause was a loose fuel cap and you tighten it properly, the ECU will eventually clear the code after several successful EVAP system tests during normal driving. This may take 3-5 drive cycles. You can also clear it with a scanner.
It is not mechanically serious and will not damage your engine or affect performance. However, it means fuel vapours are escaping into the atmosphere, and the check engine light will cause a failed emissions inspection in any EU country.
Most modern vehicles use either a vacuum-based test or a dedicated leak detection pump. The system seals itself and applies a slight vacuum or pressure, then monitors whether it holds. A small drop indicates a leak, and the ECU sets P0442.
EVAP leak causing a check engine light? P0442, P0455, P0456 explained. Start with the gas cap. Causes, diagnosis, and repair costs in euros.
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Branche un adaptateur OBD2 Bluetooth standard, scanne les codes et obtiens un diagnostic par IA avec niveaux de gravite et estimations des couts de reparation.
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