P0457 means the ECU detected an evaporative system leak consistent with a loose, missing, or damaged fuel cap. The code is specifically tuned to flag cap-sized leaks before flagging generic small (P0442) or large (P0455) leaks. The first thing to check is always the cap itself.
P0457 means the ECU detected an evaporative system leak consistent with a loose, missing, or damaged fuel cap. The code is specifically tuned to flag cap-sized leaks before flagging generic small (P0442) or large (P0455) leaks. The first thing to check is always the cap itself.
P0457 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 P0457 e accende la spia motore.
Se il tuo veicolo ha attivato P0457, potresti notare uno o più di questi sintomi:
Ecco le cause più comuni di P0457, ordinate in base alla probabilità che siano la causa del problema:
In genere sì, per brevi tragitti. P0457 is specifically a fuel cap leak code and has no effect on engine performance or safety. Tighten the cap immediately and drive normally. The check engine light will cause an automatic fail at any EU emissions inspection until the code clears.
Segui questi passaggi per individuare la causa principale di P0457:
I costi di riparazione di P0457 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.
P0457 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:
2005–2024
BMW E90 uses a screw-type fuel cap that should click multiple times when properly tightened. Newer F30 and G20 models often use a capless filler with a flapper assembly. If the flapper does not seal properly, P0457 can set even though there is no visible cap. Inspect the flapper carefully and clean any debris.
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.
2005–2024
VW Golf uses a bayonet-style fuel cap that must be turned until it clicks. Owners frequently report P0457 after a quick refuel where they forgot to twist the cap to the click point. Replacement OEM caps from VW or aftermarket from Autodoc.de cost 15 to 30 EUR.
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.
2005–2024
B7 and B8 A4 share the bayonet-style cap with the VW Golf. P0457 is one of the most common codes set on these vehicles, almost always due to operator error at the pump. Train all drivers to twist the cap until it audibly clicks at least twice.
Costi stimati per i proprietari di Audi A4adeguato al rialzo rispetto alla media a causa dei prezzi dei ricambi specifici Audi
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
2005–2024
Ford Focus Mk2 uses a standard screw-type cap with a tether. Mk3 introduced the Easy Fuel capless system on many European trims, eliminating the cap entirely. On capless models, P0457 typically traces to debris stuck in the flapper or a damaged flapper spring. Cleaning often resolves it.
Costi stimati per i proprietari di Ford Focusadeguato al ribasso rispetto alla media a causa dei prezzi dei ricambi specifici Ford
Prezzi stimati al March 2026. I costi variano in base alla regione, al veicolo e all'officina.
Questi codici compaiono spesso insieme a P0457 o indicano problemi correlati:
After tightening the cap or replacing it, the ECU needs 3 to 5 complete drive cycles to retest the EVAP system and clear the code. A drive cycle includes a cold start, mixed driving over 15 to 20 minutes, and shutdown. You can also clear it manually with a scan tool to confirm the fix immediately.
Yes. P0457 is specifically tuned to the leak size associated with a loose or missing fuel cap (typically a medium-size leak). The ECU sets P0457 rather than the generic P0455 (large leak) or P0442 (small leak) when the leak profile matches a cap-sized opening, giving the driver a more specific hint.
If you've already tightened the cap and the light returns, the rubber seal is most likely worn, cracked, or contaminated with fuel residue. Replacement caps cost 10 to 40 EUR and take seconds to install. Always buy a manufacturer-spec or OEM-equivalent cap, not the cheapest universal option.
Yes, indirectly. Overfilling the tank past the first click of the fuel nozzle can saturate the charcoal canister with liquid fuel. A saturated canister cannot hold vacuum properly during EVAP self-tests and can set leak codes including P0457. The fix is to stop topping off and let the system self-recover over several drive cycles.
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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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