What does code P23AE mean?

Q: What does code P23AE mean?

NOx Sensor Circuit Low Bank 1 Sensor 3. P23AE means the engine control module has detected a low-voltage condition on the signal circuit of the third nitrogen oxide (NOx) sensor on bank 1, which is the sensor positioned after the selective catalytic reduction system. The computer expects the sensor's signal voltage to stay within a calibrated range, and a sustained low reading tells it the circuit is shorted to ground, the sensor is failing, or the module is not receiving a valid signal.

DTC codes / P23xx · Ignition system and misfire / P23AE

P23AENOx Sensor Circuit Low Bank 1 Sensor 3

P23AE means the engine control module has detected a low-voltage condition on the signal circuit of the third nitrogen oxide (NOx) sensor on bank 1, which is the sensor positioned after the selective catalytic reduction system. The computer expects the sensor's signal voltage to stay within a calibrated range, and a sustained low reading tells it the circuit is shorted to ground, the sensor is failing, or the module is not receiving a valid signal.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

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