What does code P239F mean?

Q: What does code P239F mean?

O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2. P239F means the powertrain control module (PCM) saw the downstream oxygen sensor on bank 2 report a voltage outside its expected range while the vehicle was decelerating. During deceleration the engine goes into fuel cut, so the sensor should swing lean; this code sets when the signal stays too rich or too lean for too long under those conditions.

DTC codes / P23xx · Ignition system and misfire / P239F

P239FO2 Sensor Out of Range During Deceleration Bank 2 Sensor 2

P239F means the powertrain control module (PCM) saw the downstream oxygen sensor on bank 2 report a voltage outside its expected range while the vehicle was decelerating. During deceleration the engine goes into fuel cut, so the sensor should swing lean; this code sets when the signal stays too rich or too lean for too long under those conditions.

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.