What does code P0161 mean?
The internal heater of the rear oxygen sensor B2S2 is not operating correctly
OBD-II Code
P0161 — Oxygen Sensor Heater Circuit Malfunction Bank 2 Sensor 2
The internal heater of the rear oxygen sensor B2S2 is not operating correctly
Common symptoms
- Cold start issues
- increased fuel consumption during startup
- check engine light
Possible causes
- Damaged heater resistance
- blown fuse
- broken wiring
Initial recommendation
Check fuse and heater wiring, replace sensor if heater does not activate.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0161 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more codes