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DTC codes / P22xx · Fuel and air metering (injector circuits) / P22B5

P22B5O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 2)

P22B5 indicates that the engine control module (ECM) has detected an open circuit or abnormal condition in the pumping current trim circuit for the downstream oxygen sensor on bank 1 (Bank 1 Sensor 2). This circuit is used by the wideband oxygen sensor to fine-tune its pumping current, which directly affects the sensor's ability to accurately report exhaust oxygen content to the ECM.

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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage