What does code P22A3 mean?

Q: What does code P22A3 mean?

NOx Sensor Heater Control Circuit/Open (Bank 1 Sensor 2). P22A3 indicates that the powertrain control module has detected an open circuit or excessive resistance in the heater control circuit for the downstream nitrogen oxide sensor on bank 1. The sensor's internal heater is not drawing the expected current, so the module cannot bring the sensor up to operating temperature for accurate emissions monitoring.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22A3

P22A3NOx Sensor Heater Control Circuit/Open (Bank 1 Sensor 2)

P22A3 indicates that the powertrain control module has detected an open circuit or excessive resistance in the heater control circuit for the downstream nitrogen oxide sensor on bank 1. The sensor's internal heater is not drawing the expected current, so the module cannot bring the sensor up to operating temperature for accurate emissions monitoring.

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.