P220D code meaning
NOx Sensor Supply Voltage Circuit (Bank 2 Sensor 2)
Powertrain system Generic code P22xx codes Check engine light
What P220D means
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.
P220D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P220D
- Malfunction indicator lamp on
- SCR efficiency monitor for bank 2 not completed
Common causes of P220D
- Most likelySupply fuse, relay or ground fault for the bank 2 rear sensor
- PossibleCorroded connector exposed to road spray behind the catalyst
- Less likelyInternal fault in the supply stage of the sensor module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Nox sensor
What each part of P220D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 0D | The exact fault in that area. |
What to do next
- Note P220D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P220D
What does P220D mean?
P220D means "NOx Sensor Supply Voltage Circuit (Bank 2 Sensor 2)". 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 is a generic code, so it means the same on every make.
Is it safe to drive with P220D?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P220D fail an emissions test?
Yes, it can. P220D is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P220D to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P220D clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.