OBD-II code guide
P0150 Oxygen Sensor Circuit Bank 2 Sensor 1
P0150 means the upstream oxygen sensor circuit on bank 2 is not behaving as expected.
What it means
The bank 2 upstream oxygen sensor signal may be unreliable for fuel control.
Common symptoms
- Check engine light
- Poor fuel economy
- Rough idle
- Hesitation
- Emissions failure
Likely causes
- Oxygen sensor fault
- Wiring issue
- Exhaust leak
- Rich or lean mixture
- Connector contamination
First checks
- Confirm bank 2 location.
- Inspect wiring near the exhaust.
- Review fuel trims by bank.
- Check for exhaust leaks before replacement.