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.
Sensors & Electronics
Symptoms
- 1Check engine light on
- 2Slight decrease in fuel economy
- 3May take longer to warm up properly
- 4Usually minimal drivability symptoms
- 5Failed emissions test
Common Causes
- 1Failed O2 sensor heater element
- 2Blown fuse for O2 heater circuit
- 3Wiring or connector issues
- 4ECM/PCM driver circuit problem (rare)
How to Fix
- 1Check O2 heater fuse first
- 2Test heater circuit resistance
- 3Inspect wiring and connector
- 4Replace 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.Related Codes
P0140P0136P0137
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