P0141: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
System: Fuel / emissions · Priority: medium
What P0141 means
The control module detected a condition matching the generic definition O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2). A trouble code identifies what the module detected; it does not automatically identify the failed part.
Useful next checks
- Check heater power, fuse and ground for the downstream sensor.
- Inspect wiring near the exhaust for heat damage.
- Verify the heater circuit before replacing the sensor.
Why vehicle context matters
The same generic code can have different diagnostic paths depending on engine, calibration, wiring layout, service bulletins and related codes. Freeze-frame and live data can help establish when the fault occurred.
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