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DTC codes / P22xx · Fuel and air metering (injector circuits) / P2222

P2222NOx Sensor Heater Sense Circuit Range/Performance (Bank 2 Sensor 1)

P2222 indicates that the powertrain control module has detected an abnormal voltage or current pattern on the heater sense circuit for the bank 2 sensor 1 nitrogen oxide (NOx) sensor. The heater is not drawing the expected current during warm-up, so the computer cannot confirm that the sensor reaches operating temperature within the required time.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage