P2222NOx Sensor Heater Sense Circuit Range/Performance (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
- With P2222 the heater feedback of the bank 2 NOx sensor is electrically present, yet what it reports does not match the heating command: the cell warms too slowly or settles at the wrong resistance. No manufacturer documents this bank 2 code. Two bank 1 descriptions show the approach. GM's 3.0L LZ0 (P2209) compares raw heater resistance with its target and fails a deviation over 3 percent in 50 of 100 samples, only after 45 s of good supply and 180 s past the dew point, Type B. Ford's diesel summary uses the matching rear sensor code P220F for heater current below 0.4 A or a duty cycle more than 20 percent off. An aged heater or weak supply is typical. P2221 is the general sense fault.
- What you may notice
- Malfunction indicator lamp on
- Bank 2 NOx sensor slow to become ready after a cold start
- SCR monitor for bank 2 delayed
- Likely causes
- LikelyAged heater in the bank 2 NOx probe with drifted resistance
- PossibleLow supply voltage or poor ground at the sensor module
- RareHeater wiring with added resistance
- 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: €150 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.