What does code P23AB mean?

Q: What does code P23AB mean?

NOx Sensor Processor Performance Bank 1 Sensor 3. P23AB indicates that the powertrain control module has detected a performance fault within the signal-processing circuitry of the nitrogen oxide (NOx) sensor located after the selective catalytic reduction (SCR) system on bank 1, designated as sensor 3. The computer monitors the sensor's internal processor for expected response times and signal rationality, and it sets this code when the processor's output does not correlate with the exhaust conditions the module is commanding.

DTC codes / P23xx · Ignition system and misfire / P23AB

P23ABNOx Sensor Processor Performance Bank 1 Sensor 3

P23AB indicates that the powertrain control module has detected a performance fault within the signal-processing circuitry of the nitrogen oxide (NOx) sensor located after the selective catalytic reduction (SCR) system on bank 1, designated as sensor 3. The computer monitors the sensor's internal processor for expected response times and signal rationality, and it sets this code when the processor's output does not correlate with the exhaust conditions the module is commanding.

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.