What does code P237B mean?

Q: What does code P237B mean?

O2 Sensor Exhaust Sample Error Bank 2 Sensor 2. P237B indicates that the powertrain control module (PCM) has detected an error in the exhaust sample being reported by the downstream oxygen sensor on bank 2, sensor 2. The PCM monitors the sensor's signal for expected voltage switching and rationality, and this code sets when the sample is deemed invalid, out of range, or inconsistent with the engine's operating conditions.

DTC codes / P23xx · Ignition system and misfire / P237B

P237BO2 Sensor Exhaust Sample Error Bank 2 Sensor 2

P237B indicates that the powertrain control module (PCM) has detected an error in the exhaust sample being reported by the downstream oxygen sensor on bank 2, sensor 2. The PCM monitors the sensor's signal for expected voltage switching and rationality, and this code sets when the sample is deemed invalid, out of range, or inconsistent with the engine's operating 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.