P2197O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2197 is the bank 2 version of P2195 on engines with a front sensor per bank: the bank 2 front oxygen or A/F sensor keeps reporting lean in a way the ECM rejects. GM's Bosch-based 2005 2.8 and 3.6 V6 flag it when the bank 2 rear sensor reads rich (above 0.85 V) while the front sensor reads leaner than lambda 1.08 with short-term trim at its 1.25 maximum, a contradiction a real lean mixture would not produce. Ford applies its switching, trim-limit and, from 2019, stuck-lambda tests to bank 2 the same way, with a 30 s window. Ford's 2017 bulletin for 2015 to 2017 Explorer and 2015 to 2016 F-150 3.5 GTDI lists P2195 and P2197 with P2626 and P2629, the pumping-current trim circuits of the A/F sensors, and fixes them with new heated oxygen sensors. If only bank 2 is affected, an exhaust manifold leak on that side ahead of the sensor is worth ruling out before replacing the sensor.
- What you may notice
- Malfunction indicator lamp on
- Possible rough running or higher consumption
- Likely causes
- LikelyBank 2 front oxygen or A/F sensor aged or contaminated
- PossibleExhaust manifold leak on bank 2 ahead of the sensor
- 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.