What does code P22B6 mean?

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22B6

P22B6O2 Sensor Pumping Current Trim Circuit Low (Bank 1 Sensor 2)

P22B6 indicates the engine control module has detected that the pumping current trim circuit for the downstream oxygen sensor on bank 1 is reporting a voltage or current below the expected range. This circuit is part of the sensor's internal ion-pump cell, which the module uses to fine-tune the air-fuel ratio reading after the catalytic converter.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.