P0446 means the ECU has detected a problem with the EVAP vent control circuit. The vent valve controls airflow through the charcoal canister that captures fuel vapours. When the valve or its circuit fails, the EVAP system cannot properly purge or seal, triggering this code.
P0446 means the ECU has detected a problem with the EVAP vent control circuit. The vent valve controls airflow through the charcoal canister that captures fuel vapours. When the valve or its circuit fails, the EVAP system cannot properly purge or seal, triggering this code.
P0446 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 P0446 e accende la spia motore.
Se il tuo veicolo ha attivato P0446, potresti notare uno o più di questi sintomi:
Ecco le cause più comuni di P0446, ordinate in base alla probabilità che siano la causa del problema:
In genere sì, per brevi tragitti. Completely safe to drive. The EVAP system controls fuel vapour emissions and has no effect on engine performance or safety. The only consequence is a lit check engine light and emissions test failure.
Segui questi passaggi per individuare la causa principale di P0446:
I costi di riparazione di P0446 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.
P0446 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:
2007-2024
Toyota Camry EVAP vent valves are located near the charcoal canister at the rear of the vehicle. The valve is a simple two-wire solenoid. Toyota's EVAP self-test runs during specific drive conditions, so the code may take several drive cycles to appear or clear. Common on high-mileage Camrys in humid climates where corrosion affects the valve connector.
2006-2024
Honda Civics have the EVAP vent valve integrated near the fuel tank. Access may require partial removal of rear interior trim or underbody panels. The 2016+ 1.5T models have a revised EVAP system. Honda's EVAP testing is sensitive, so even minor connector issues can trigger P0446.
Costi stimati per i proprietari di Honda Civicadeguato al ribasso rispetto alla media a causa dei prezzi dei ricambi specifici Honda
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
2005-2024
VW EVAP systems use an N80 purge valve and a separate vent valve. P0446 on the Golf typically points to the vent valve near the charcoal canister. On some model years, the canister is mounted inside the rear bumper area, making access tight. The N80 purge valve is a separate component and triggers different codes (P0441, P0443).
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 EVAP systems are more complex than most, with multiple valves and a fuel tank leak detection pump. P0446 on a BMW may also involve the leak detection pump or its associated wiring. The charcoal canister and vent valve are typically accessible from under the rear of the car. BMW-specific scan tools provide more detailed EVAP test results than generic OBD2 scanners.
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.
Questi codici compaiono spesso insieme a P0446 o indicano problemi correlati:
Yes, completely safe. The EVAP system only controls fuel vapour emissions. No effect on engine performance or safety. You'll fail emissions testing though.
A solenoid-controlled valve that allows fresh air into the charcoal canister during purge cycles. When the ECU tests the EVAP system for leaks, it closes the vent valve to seal the system. If it can't close or the circuit fails, P0446 is set.
Rarely. A bad gas cap more commonly triggers P0440 or P0455 (large leak). P0446 specifically points to the vent control circuit, not a general leak. But checking the cap first is free and takes 10 seconds.
The vent valve itself costs 30-120 euros. Labour is 40-150 euros since the valve is usually accessible near the rear of the vehicle. Total: 70-270 euros for most vehicles.
Fixing P0446 costs 60-180 euros total to replace the EVAP vent solenoid. Check the connector for corrosion first, as wiring is the second most common cause.
Clearing a code before inspection resets the readiness monitors, and stations check those. Here are the OBD2 codes that fail, and why a fresh clear fails anyway.
A petrol smell in your car can be a loose fuel cap or a dangerous fuel leak. Learn what each cause means and when the smell is a genuine fire risk.
EVAP leak causing a check engine light? P0442, P0455, P0456 explained. Start with the gas cap. Causes, diagnosis, and repair costs in euros.
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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