P2195 O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 1)
What does P2195 mean?
P2195 — O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 1) (bank 1). This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects o2 sensor signal biased/stuck lean (bank 1, sensor 1) on bank 1. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P2195
- Failed upstream oxygen sensor
- Contaminated sensor tip
- Exhaust leak ahead of the sensor
- Damaged sensor wiring
- Incorrect fuel trim compensation masking a lean bias
How to fix P2195
- Check for exhaust leaks and intake vacuum leaks first
- Watch the sensor voltage against fuel trim and fuel commands
- Test the sensor response by commanding fuel changes
- Verify the signal circuit wiring
- Replace the sensor if it remains biased lean