P0150 O2 Sensor Circuit (Bank 2 Sensor 1)
Fault in the circuit of the upstream (before the catalytic converter) oxygen sensor, Bank 2 Sensor 1.
Common causes
- Faulty oxygen sensor
- Wiring or connector damage
- Exhaust leak near the sensor
Symptoms
- Check engine light
- Poor fuel economy
What to check
- Inspect wiring routed near the exhaust
- Check for exhaust leaks
- Watch sensor voltage switching on a scan tool
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0150, follow the service information for that make and model.