What does code P23C1 mean?

Q: What does code P23C1 mean?

NOx Sensor Sensing Element Bank 1 Sensor 3. P23C1 indicates that the powertrain control module has detected a fault with the sensing element inside the nitrogen oxide (NOx) sensor located after the selective catalytic reduction (SCR) system on bank 1, sensor 3. The computer monitors the sensor's internal circuitry and signal response, and it sets this code when the sensing element's performance falls outside the expected range, which can affect the vehicle's ability to monitor NOx levels and control emissions.

DTC codes / P23xx · Ignition system and misfire / P23C1

P23C1NOx Sensor Sensing Element Bank 1 Sensor 3

P23C1 indicates that the powertrain control module has detected a fault with the sensing element inside the nitrogen oxide (NOx) sensor located after the selective catalytic reduction (SCR) system on bank 1, sensor 3. The computer monitors the sensor's internal circuitry and signal response, and it sets this code when the sensing element's performance falls outside the expected range, which can affect the vehicle's ability to monitor NOx levels and control emissions.

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.