P00D6HO2S Sensor Correlation Bank 2 Sensor 1/Bank 2 Sensor 2
- 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
- During fuel cut-off on overrun the exhaust gas is pure air, so the oxygen sensors before and behind the catalytic converter must both report the same lean value. A documented method averages and normalises the signals of both sensors during fuel cut-off and sets the code when they differ by more than a limit; it runs once per drive cycle and needs several overrun phases. The code points to one of the sensors having drifted, not to the catalytic converter. The manufacturer documenting it uses wide-band sensors in both positions. For bank 2 no manufacturer description was found; the explanation follows the documented bank 1 code. Bank 2 exists only on V and boxer engines.
- What you may notice
- Check engine light on
- Usually no noticeable drivability problem
- Catalyst readiness may stay incomplete
- Likely causes
- LikelyUpstream sensor aged or shifted
- LikelyDownstream sensor aged or shifted
- PossibleAir or exhaust leak between the sensors falsifying the lean signal
- RareRetrofitted sensor with wrong characteristic, or software
- 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: €200 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.