What does code P22A5 mean?

Q: What does code P22A5 mean?

NOx Sensor Heater Control Circuit High (Bank 1 Sensor 2). P22A5 means the engine control module has detected an abnormally high voltage on the heater control circuit for the downstream nitrogen oxide (NOx) sensor on bank 1. The computer expects a specific current draw through the heater element, and a high-voltage reading tells it the circuit is open, has excessive resistance, or the heater element itself has failed.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22A5

P22A5NOx Sensor Heater Control Circuit High (Bank 1 Sensor 2)

P22A5 means the engine control module has detected an abnormally high voltage on the heater control circuit for the downstream nitrogen oxide (NOx) sensor on bank 1. The computer expects a specific current draw through the heater element, and a high-voltage reading tells it the circuit is open, has excessive resistance, or the heater element itself has failed.

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.