What does code P23AD mean?

Q: What does code P23AD mean?

NOx Sensor Circuit Range or Performance Bank 1 Sensor 3. P23AD indicates that the powertrain control module has detected an out-of-range or performance fault in the NOx sensor circuit for bank 1 sensor 3, which is typically a downstream nitrogen oxide sensor used to monitor SCR efficiency. The computer compares the sensor's signal against expected values and flags the code when the voltage or current remains outside the valid range for too long or does not respond correctly to changes in engine operation.

DTC codes / P23xx · Ignition system and misfire / P23AD

P23ADNOx Sensor Circuit Range or Performance Bank 1 Sensor 3

P23AD indicates that the powertrain control module has detected an out-of-range or performance fault in the NOx sensor circuit for bank 1 sensor 3, which is typically a downstream nitrogen oxide sensor used to monitor SCR efficiency. The computer compares the sensor's signal against expected values and flags the code when the voltage or current remains outside the valid range for too long or does not respond correctly to changes in engine operation.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.