P2216NOx Sensor Circuit High (Bank 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
- P2216 is set when the NOx concentration reported for bank 2 exceeds anything the engine could plausibly emit. It belongs to engines with an SCR line per cylinder bank; none of the documented diesels is built that way, and no manufacturer lists P2216 publicly. The bank 1 code P2203 shows what such a check looks like: GM trips at 1,500 or 2,500 ppm on the 6.6L LML and at 2,500 ppm on the 3.0L LZ0 (Type B, two trips), VW at 1,655 ppm on the 2014 Touareg TDI. An overreading probe can make the dosing controller inject too much DEF, risking ammonia slip, so the reading is discarded. Internal sensor failure is the most frequent reason. P2215 is the low limit, P2214 a believable but wrong value.
- What you may notice
- Malfunction indicator lamp on
- Implausibly high NOx value for bank 2 in live data
- SCR efficiency codes may follow
- Likely causes
- LikelyBank 2 NOx sensor reading too high due to internal failure
- PossibleSensing element fouled by oil ash or DEF crystals
- RareCalibration error in the engine or dosing control 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: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.