What does code P23BB mean?

Q: What does code P23BB mean?

NOx Sensor Heater Resistance Bank 1 Sensor 3. P23BB indicates that the powertrain control module has detected an abnormal electrical condition in the heater circuit of the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder number one. The computer monitors the heater element's current draw during startup and continuous operation, and it sets this code when the measured resistance falls outside the expected range for the sensor's temperature.

DTC codes / P23xx · Ignition system and misfire / P23BB

P23BBNOx Sensor Heater Resistance Bank 1 Sensor 3

P23BB indicates that the powertrain control module has detected an abnormal electrical condition in the heater circuit of the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder number one. The computer monitors the heater element's current draw during startup and continuous operation, and it sets this code when the measured resistance falls outside the expected range for the sensor's temperature.

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.