All codes
O2 Sensor Heater Circuit Bank 1 Sensor 2
Diagnose P0141 oxygen sensor heater code. Learn about the downstream O2 sensor heater circuit and repair options.
What you may notice
Symptoms
- 01Check engine light on
- 02Slight decrease in fuel economy
- 03May take longer to warm up properly
- 04Usually minimal drivability symptoms
- 05Failed emissions test
Where to look first
Common causes
- 01Failed O2 sensor heater element
- 02Blown fuse for O2 heater circuit
- 03Wiring or connector issues
- 04ECM/PCM driver circuit problem (rare)
Step by step
What to check and repair
- 01Check O2 heater fuse first
- 02Test heater circuit resistance
- 03Inspect wiring and connector
- 04Replace O2 sensor if heater failed
What Does P0141 Mean?
P0141 indicates a problem with the heater circuit for the downstream oxygen sensor (Bank 1, Sensor 2), located after the catalytic converter.
Why O2 Sensors Have Heaters
O2 sensors need to reach operating temperature (600°F+) to work properly. The heater gets them up to temperature quickly after cold starts.
Heater Circuit Issues
Problems are usually the heater element inside the sensor failing, or wiring/fuse issues in the heater circuit.