P2196 O2 Sensor Signal Biased/Stuck Rich (Bank 1, Sensor 1)
What does P2196 mean?
P2196 — O2 Sensor Signal Biased/Stuck Rich (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 rich (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 P2196
- Failed upstream oxygen sensor
- Contaminated sensor
- Shorted signal wiring
- Actual rich mixture from fuel pressure or injectors
- Faulty fuel trim data
How to fix P2196
- Check fuel pressure and trims for a real rich condition
- Watch sensor voltage under commanded fuel changes
- Test the signal circuit for shorts
- Inspect the sensor for contamination
- Replace the sensor after ruling out fuel system faults