P0137 : O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

P0137 means the downstream oxygen sensor on Bank 1 (post-catalyst, Sensor 2) is reporting a voltage that stays too low for too long. This typically indicates a lean exhaust condition reaching the sensor, an exhaust leak ahead of the sensor, or a failed sensor stuck at low voltage. The downstream sensor should read a relatively steady 0.6–0.8V when the catalytic converter is working properly.

P0137 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0137 et allume le voyant moteur.

Si ton vehicule a declenche P0137, tu peux remarquer un ou plusieurs de ces symptomes :

• Check engine light illuminated
• Slight increase in fuel consumption
• Possible failed emissions test
• Usually no noticeable change in how the car drives
• Often appears alongside P0420 if the converter is degrading

Voici les causes les plus courantes de P0137, classees selon la probabilite qu'elles soient en cause :

En general oui, pour des trajets courts. Safe to drive short term. The downstream sensor does not directly control fuel mixture, but a persistent low signal often points to a damaged sensor, an exhaust leak, or a degrading catalytic converter. Do not delay repairs beyond a few weeks.

Suis ces etapes pour identifier la cause profonde de P0137 :

1. Read freeze frame data and check for any companion codes (P0420, P0171, P0174) that suggest a lean condition or converter problem
2. Inspect the exhaust system between the catalytic converter and the downstream sensor for cracks, loose clamps, or leaking gaskets
3. Inspect the Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, or chafing
4. Use a scan tool to view downstream sensor voltage. A healthy sensor reads around 0.6–0.8V steady. A reading stuck below 0.2V points to sensor failure or an exhaust leak
5. Substitute a known-good sensor or swap with the Bank 2 downstream sensor if equipped. If the low voltage follows the sensor, the sensor is faulty

Les couts de reparation de P0137 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :

P0137 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 :

Ces codes apparaissent souvent avec P0137 ou indiquent des problemes connexes :