Powertrain
generic / SAE
P0147
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
The ECU detects an electrical fault in the heater circuit of the third O2 sensor on bank 1. Heater current out of range, indicating open/shorted heater element, blown fuse or wiring fault.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 47
Possible causes
- Heater element open 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
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References
sae:J2012