Powertrain
generic / SAE
P0141
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
The heating element inside the downstream oxygen sensor on bank 1 is open-circuit, drawing no current, or drawing too much. Without heater, the sensor takes much longer to reach operating temperature, delaying catalyst diagnosis.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 41
Possible causes
- Heater element open-circuit high
- Heater fuse blown medium
Symptoms
- Check engine light on after several drive cycles
- Slightly increased fuel consumption during cold start
- Delayed entry into closed-loop fuel control
- Failed emissions inspection (lambda readiness)
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–250 €
- Estimated time: 0.3–1.5 h
- Component: oxygen sensor downstream
- Component: oxygen sensor heater relay
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012