P0158
O2 Sensor Circuit High Voltage Bank 2 Sensor 2
Severity: MEDIUM
Symptoms
- Increased fuel consumption
- Rough engine operation
- Check Engine Light Illuminates
- Dips during acceleration
Causes
- Oxygen sensor malfunction
- Open/short circuit in sensor circuit
- Sensor contamination (oil, antifreeze)
- Fuel system problems (rich mixture)
- Malfunction of the catalytic converter
How to Fix
- Check the integrity of the wiring harness and sensor connectors
- Check the voltage at the sensor using a scanner or oscilloscope
- Replace the oxygen sensor if the fault is confirmed
- Check the fuel system for over-rich mixture
- Check the condition of the catalytic converter