P0131 means the upstream oxygen sensor on bank 1 is consistently reporting a low voltage, indicating a lean exhaust condition. The ECU may compensate by adding extra fuel, causing rich running. This code often points to a failing O2 sensor or an actual lean condition.
P0131 means the upstream oxygen sensor on bank 1 is consistently reporting a low voltage, indicating a lean exhaust condition. The ECU may compensate by adding extra fuel, causing rich running. This code often points to a failing O2 sensor or an actual lean condition.
P0131 è un codice diagnostico di guasto relativo a emissioni, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0131 e accende la spia motore.
Se il tuo veicolo ha attivato P0131, potresti notare uno o più di questi sintomi:
Ecco le cause più comuni di P0131, ordinate in base alla probabilità che siano la causa del problema:
In genere sì, per brevi tragitti. You can drive to a workshop, but the engine may run rich, increasing fuel consumption and potentially damaging the catalytic converter over time. Do not delay repairs for more than a few days.
Segui questi passaggi per individuare la causa principale di P0131:
I costi di riparazione di P0131 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.
P0131 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
The 1ZR-FE and 2ZR-FE engines are reliable, but O2 sensors typically need replacement around 120,000-150,000 km. Use a Denso sensor (OE supplier) for best compatibility. The upstream sensor is easily accessible on the exhaust manifold.
Costi stimati per i proprietari di Toyota Corollaadeguato 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.
2005-2024
The EA888 2.0 TSI and 1.4 TSI engines use wideband (AFR) sensors rather than traditional narrowband O2 sensors. These are more expensive to replace. Vacuum leaks from the PCV system or intake manifold are common triggers on turbo engines.
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
Honda Civics with the R18A engine commonly trigger P0131 from O2 sensor aging around 130,000 km. The 1.5L turbo (L15B7) can develop vacuum leaks at the turbo inlet pipe, causing real lean conditions that trigger both P0131 and P0171.
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.
Questi codici compaiono spesso insieme a P0131 o indicano problemi correlati:
P0131 means the upstream oxygen sensor on bank 1 is reading low voltage consistently, which the ECU interprets as a lean exhaust condition. This sensor is critical for fuel mixture control - when it fails, the engine cannot properly regulate the air-fuel ratio.
Yes, for short distances. The ECU compensates by richening the fuel mixture, which increases fuel consumption and can damage the catalytic converter over time. Schedule a repair within a few days to prevent secondary damage.
Most modern oxygen sensors last 100,000 to 150,000 km. However, exposure to coolant leaks, silicone sealants, or contaminated fuel can shorten their lifespan significantly. If your vehicle has high mileage and the original sensors, age is the likely cause.
No. P0131 specifically indicates the O2 sensor circuit is reading low voltage (a sensor-side problem). P0171 indicates the fuel system is actually running lean based on long-term fuel trims. However, both can appear together if there is a real lean condition.
Test a lambda sensor with OBD2 live voltage or a multimeter, learn why cleaning is a myth, and see what replacement actually costs. Petrol and diesel covered.
Spia motore accesa, consumi peggiori e minimo irregolare spesso indicano una sonda lambda esausta. I sintomi, le cause, i codici e quanto costa.
P0171 repair cost runs €50 to €800: a vacuum leak or dirty MAF sensor are the cheapest, common fixes. How to diagnose with fuel trims and fix it yourself.
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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