P220DNOx Sensor Supply Voltage Circuit (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
- P220D covers the last position in this group: the downstream NOx sensor on bank 2, after that bank's own SCR catalyst, has a supply voltage outside its window. It only exists on engines whose two banks keep separate aftertreatment, which none of the publicly documented diesel applications do; no manufacturer lists the code with thresholds. Ford's bank 1 rear sensor code P220B uses 8.5 to 16.5 V, a useful reference. A dead rear sensor means the efficiency monitor for the bank 2 catalyst cannot finish. CARB requires NOx sensor diagnostics to catch wiring breaks and readings beyond range. P220C is the upstream sensor on the same bank, P220B the rear sensor on bank 1. Check supply fuse, ground and connector first.
- What you may notice
- Malfunction indicator lamp on
- SCR efficiency monitor for bank 2 not completed
- Likely causes
- LikelySupply fuse, relay or ground fault for the bank 2 rear sensor
- PossibleCorroded connector exposed to road spray behind the catalyst
- RareInternal fault in the supply stage of the sensor module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.