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 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0131 et allume le voyant moteur.
Si ton vehicule a declenche P0131, tu peux remarquer un ou plusieurs de ces symptomes :
Voici les causes les plus courantes de P0131, classees selon la probabilite qu'elles soient en cause :
En general oui, pour des trajets courts. 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.
Suis ces etapes pour identifier la cause profonde de P0131 :
Les couts de reparation de P0131 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.
P0131 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 :
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.
Couts estimes pour les proprietaires de Toyota Corollaajuste 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.
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.
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
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.
Couts estimes pour les proprietaires de Honda Civicajuste a la baisse par rapport a la moyenne en raison du prix des pieces specifiques a Honda
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
Ces codes apparaissent souvent avec P0131 ou indiquent des problemes connexes :
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.
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