P2200NOx Sensor Circuit (Bank 1 Sensor 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2200 is the general electrical fault reported for the front NOx sensor on bank 1, the unit ahead of the SCR catalyst. Such sensors carry their own control unit, which checks the probe wiring and reports the result over CAN. GM's 6.6L Duramax (LML) sets P2200 as a Type A fault once an open-circuit status keeps arriving for more than 0.5 s or 10 s, depending on calibration. Ford's 6.7L and 3.0L diesels use it for shorts or opens on the probe lines and for memory checksum errors inside the sensor controller. VW's 2014 Touareg TDI reacts to an error message or a validity ratio of at least 0.5. P2201 covers plausibility, P2202/P2203 a value out of range, P229E the downstream sensor. Dosing loses its feedback and the MIL comes on.
- What you may notice
- Malfunction indicator lamp on
- No NOx value in live data from the upstream sensor
- SCR or emissions warning, possibly followed by inducement countdown
- Likely causes
- LikelyInternal fault in the NOx probe or its attached control unit
- PossibleDamaged cable between probe and sensor control unit (heat, chafing)
- PossibleMoisture or corrosion in the sensor connector
- RareUnstable supply or ground at the sensor control unit
- 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: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.