P0155
O2 Sensor Heater Circuit Bank 2 Sensor 1
Severity: MEDIUM
Symptoms
- Increased fuel consumption
- Unstable engine operation at idle
- Reduced engine power
- Check Engine Light Illuminates
Causes
- Open or short circuit in the sensor heating circuit
- Malfunction of the oxygen sensor itself
- Problems in the wiring harness or connectors
- Faulty heating circuit relay or fuse
- Problems with the engine control unit (ECU)
How to Fix
- Check the integrity of the sensor heating circuit (resistance and voltage)
- Inspect the wiring harness and connectors for damage.
- Check the fuse and relay of the heating circuit
- If necessary, replace the oxygen sensor
- Clear error memory and check if code is returned