OBD codes / P0161
P0161
ModerateO2 Sensor Heater Circuit (Bank 2, Sensor 2)
Get it looked at soon to avoid further wear.
Likely causes
- failed bank 2 downstream O2 heater
- blown fuse
- wiring fault
Common fixes
- replace the bank 2 rear O2 sensor
- check fuse and wiring
Seeing P0161 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0161 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.