What does code P2223 mean?

Q: What does code P2223 mean?

NOx Sensor Heater Sense Circuit Low. P2223 means the engine computer has detected an abnormally low voltage on the heater sense circuit for the nitrogen oxide (NOx) sensor, which is used on diesel engines to monitor emissions. The heater element inside the sensor is not drawing the current the computer expects, so the sensor may not reach operating temperature and the system cannot accurately measure NOx levels.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P2223

P2223NOx Sensor Heater Sense Circuit Low

P2223 means the engine computer has detected an abnormally low voltage on the heater sense circuit for the nitrogen oxide (NOx) sensor, which is used on diesel engines to monitor emissions. The heater element inside the sensor is not drawing the current the computer expects, so the sensor may not reach operating temperature and the system cannot accurately measure NOx levels.

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.