P2195O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2195 means the front oxygen or air-fuel sensor on bank 1 reports a lean mixture that the ECM does not believe, either because it stays lean or because it disagrees with other evidence. On GM's Bosch-based 2005 V6 the rear sensor has to read rich (above 0.85 V) while the front A/F sensor reads leaner than lambda 1.08 and the short-term trim sits at its maximum of 1.25, for about 100 s or 50 s in total. Ford checks narrow-band sensors for fewer than 5 switches in 30 s and wide-band sensors for 30 s at the short-term trim limit; from 2019 a sensor whose filtered lambda changes by less than 0.0001 for 30 s sets P2195 if the value is at or above 1. On the Opel/GM 2.0 turbo in the Saab 9-5 (2010) the code sets within 4 s continuously or 50 s in total. Ford replaced the heated oxygen sensors for P2195 and P2197 on 2015 to 2017 Explorer and F-150 3.5 GTDI. An exhaust leak ahead of the sensor can also make it read lean.
- What you may notice
- Malfunction indicator lamp on
- Possible rough running or higher consumption from wrong fuelling
- Likely causes
- LikelyFront oxygen or A/F sensor aged or contaminated
- PossibleExhaust leak ahead of the sensor
- RareSensor signal or reference wiring fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.