P2276O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 3)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2276 needs three oxygen sensors on bank 2, so it only occurs on V or flat engines whose second bank carries a front, a mid-catalyst and a post-catalyst sensor. It reports that the post-catalyst sensor of bank 2 does not reach a rich reading. No manufacturer publishes a threshold for this exact code; Jaguar Land Rover lists it, with P2277 and the heater and circuit codes of that sensor, for the 2014 to 2016 3.0 supercharged V6 in the LR4, Range Rover and Range Rover Sport, where water on the hot element cracked the sensor. Ford's monitor runs the same switch-point test on sensors 2 and 3 and fails a rich peak below 0.42 V. CARB requires secondary sensors to be checked for sufficient output. If bank 1 is fault-free, compare both third sensors and look for an exhaust leak on bank 2.
- What you may notice
- Malfunction indicator lamp on
- No noticeable change in driveability
- Likely causes
- LikelyBank 2 third oxygen sensor aged or cracked by water
- PossibleExhaust leak on bank 2 ahead of sensor 3
- RareDamaged wiring or connector of sensor 3
- 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.