OBD-II code guide
P2195 Oxygen Sensor Signal Stuck Lean Bank 1 Sensor 1
P2195 means the upstream oxygen sensor signal appears stuck lean on bank 1.
What it means
The computer sees a lean oxygen sensor signal that may be caused by a real lean condition or a sensor/circuit problem.
Common symptoms
- Check engine light
- Rough idle
- Hesitation
- Poor fuel economy
- Possible hard start
Likely causes
- Vacuum leak
- Exhaust leak
- Low fuel pressure
- Oxygen sensor fault
- Wiring or connector issue
First checks
- Check for vacuum leaks before replacing the sensor.
- Review fuel trim data.
- Inspect exhaust leaks near the sensor.
- Look for P0171 or MAF-related codes.