What does code P224A mean?

Q: What does code P224A mean?

NOx Sensor Heater Resistance (Bank 1 Sensor 1). P224A indicates that the powertrain control module has detected an abnormal electrical condition in the heater circuit of the upstream nitrogen oxide (NOx) sensor on bank 1. The computer monitors the heater element's resistance and flags this code when the measured current or voltage falls outside the expected range for the sensor's temperature.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P224A

P224ANOx Sensor Heater Resistance (Bank 1 Sensor 1)

P224A indicates that the powertrain control module has detected an abnormal electrical condition in the heater circuit of the upstream nitrogen oxide (NOx) sensor on bank 1. The computer monitors the heater element's resistance and flags this code when the measured current or voltage falls outside the expected range for the sensor's temperature.

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.