P220FNOx Sensor Heater Control Circuit Range/Performance (Bank 1 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
- P220F is the heater check of the rear NOx sensor on bank 1, the one after the SCR catalyst. Ford's diesel summary (it titles the code as a heater sense circuit fault) flags a heater current under 0.4 A, a short to battery or to ground, or a heater duty cycle more than 20 percent away from the expected value. Volvo and Mack use P220F with failure type 93 for their outlet sensor and recommend replacing only that sensor when the code is confirmed. Because the rear sensor confirms catalyst efficiency, a cold sensor delays or blocks the SCR monitor. P220E is the upstream counterpart; P22A3-P22A5 are the plain heater circuit faults of sensor 2. The MIL comes on, while the engine runs normally.
- What you may notice
- Malfunction indicator lamp on
- SCR efficiency monitor not completing
- Likely causes
- LikelyHeater of the downstream NOx probe weak or failed
- PossibleHeater wiring of the rear sensor shorted or with high resistance
- RareWater or salt in the rear sensor connector
- 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.