OBD codes / P0137
P0137
ModerateO2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
Get it looked at soon to avoid further wear.
Likely causes
- failing downstream O2 sensor
- exhaust leak
- wiring fault
Common fixes
- replace the rear O2 sensor
- check for exhaust leaks
Seeing P0137 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0137 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.