What does code P23B0 mean?

Q: What does code P23B0 mean?

NOx Sensor Circuit Intermittent Bank 1 Sensor 3. P23B0 means the engine computer has detected an intermittent fault in the electrical circuit for the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder number one. The computer monitors the sensor's signal and heater circuit for brief dropouts or erratic readings that occur too quickly for a steady fault code to set.

DTC codes / P23xx · Ignition system and misfire / P23B0

P23B0NOx Sensor Circuit Intermittent Bank 1 Sensor 3

P23B0 means the engine computer has detected an intermittent fault in the electrical circuit for the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder number one. The computer monitors the sensor's signal and heater circuit for brief dropouts or erratic readings that occur too quickly for a steady fault code to set.

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.