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 è un codice diagnostico di guasto relativo a sistema evap, classificato con gravità low. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0442 e accende la spia motore.
Se il tuo veicolo ha attivato P0442, potresti notare uno o più di questi sintomi:
Ecco le cause più comuni di P0442, ordinate in base alla probabilità che siano la causa del problema:
In genere sì, per brevi tragitti. 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.
Segui questi passaggi per individuare la causa principale di P0442:
I costi di riparazione di P0442 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
P0442 si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:
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.
Costi stimati per i proprietari di Volkswagen Golfadeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici Volkswagen
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
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.
Costi stimati per i proprietari di BMW 3 Seriesadeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici BMW
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
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.
Costi stimati per i proprietari di Toyota Yarisadeguato al ribasso rispetto alla media a causa dei prezzi dei ricambi specifici Toyota
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
Questi codici compaiono spesso insieme a P0442 o indicano problemi correlati:
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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A check engine light with no symptoms can still mean a fault that costs you later. Read the code yourself for 15 euros to find out if runs fine is really fine.
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Collega un adattatore OBD2 Bluetooth standard, esegui la scansione dei codici e ottieni una diagnosi basata sull'IA con livelli di gravità e stime dei costi di riparazione.
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