What does code P23B3 mean?

Q: What does code P23B3 mean?

NOx Sensor Heater Control Circuit High Bank 1 Sensor 3. P23B3 means the engine computer has detected an abnormally high voltage on the heater control circuit for the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder one. The computer expects the heater circuit to draw current in a normal range, and a high-voltage reading tells it the circuit is open, has excessive resistance, or is not being pulled low by the sensor heater element.

DTC codes / P23xx · Ignition system and misfire / P23B3

P23B3NOx Sensor Heater Control Circuit High Bank 1 Sensor 3

P23B3 means the engine computer has detected an abnormally high voltage on the heater control circuit for the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder one. The computer expects the heater circuit to draw current in a normal range, and a high-voltage reading tells it the circuit is open, has excessive resistance, or is not being pulled low by the sensor heater element.

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.