Powertrain, generic (extended)

P220F NOx Sensor Heater Control Circuit Range/Performance (Bank 1 Sensor 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Heater of the downstream NOx probe weak or failed
Heater wiring of the rear sensor shorted or with high resistance
Water or salt in the rear sensor connector

Symptoms

  • Malfunction indicator lamp on
  • SCR efficiency monitor not completing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–1,000
Time0.7–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

nox sensornox sensor heater

Related codes

P220EP22A3P22A4P229EP220B

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.