OBD-II code guide
P0141 Oxygen Sensor Heater Circuit Bank 1 Sensor 2
P0141 means the downstream oxygen sensor heater circuit on bank 1 has a fault.
What it means
The catalyst monitor sensor may warm up too slowly or fail heater checks.
Common symptoms
- Check engine light
- Usually normal driving
- Failed emissions test
- Possible P0420
- No obvious symptom
Likely causes
- Failed sensor heater
- Blown fuse
- Wiring damage
- Poor connector
- Exhaust heat damage
First checks
- Inspect the downstream sensor wiring.
- Check heater circuit power and ground.
- Look for blown fuses caused by wiring shorts.
- Avoid confusing this with a catalyst failure by itself.