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 è un codice diagnostico di guasto relativo a emissioni, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P0137 e accende la spia motore.

Se il tuo veicolo ha attivato P0137, potresti notare uno o più di questi sintomi:

• 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

Ecco le cause più comuni di P0137, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. 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.

Segui questi passaggi per individuare la causa principale di 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

I costi di riparazione di P0137 variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P0137 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:

Questi codici compaiono spesso insieme a P0137 o indicano problemi correlati: