OBD codes / P0151
P0151
ModerateO2 Sensor Circuit Low Voltage (Bank 2, Sensor 1)
Get it looked at soon to avoid further wear.
Likely causes
- failing upstream O2 sensor on bank 2
- exhaust leak
- wiring fault
Common fixes
- replace the bank 2 upstream O2 sensor
- check for exhaust leaks
Seeing P0151 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0151 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.