P0141
P0141 O2 Sensor Heater Bank 1 Sensor 2
P0141 points to the heater circuit for the downstream oxygen sensor after the catalytic converter on bank 1.
How urgent is P0141?
It usually does not cause major drivability symptoms, but it can affect catalyst monitoring and emissions readiness.
Common symptoms
- Check engine light
- Failed emissions readiness
- Usually drives normally
- Possible fuel economy drop
Likely causes
- Failed downstream O2 sensor heater
- Damaged exhaust-side wiring
- Blown fuse
- Poor connector contact
- Rare PCM fault
What to check before replacing parts
1
Inspect sensor wiring near exhaust heat
2
Check heater fuse
3
Measure heater resistance
4
Verify power and ground
5
Confirm sensor position before replacement
Use the code with symptoms
A code points at the system, not always the failed part. Add your vehicle, mileage, symptoms, and whether the check engine light is steady or flashing so the AI diagnostic can narrow the next step.