What does code P22B7 mean?

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22B7

P22B7O2 Sensor Pumping Current Trim Circuit High (Bank 1 Sensor 2)

P22B7 indicates that the powertrain control module (PCM) has detected an abnormally high current in the trim circuit for the oxygen sensor's pumping cell on Bank 1 Sensor 2, which is the downstream sensor after the catalytic converter. The PCM monitors this current to fine-tune the sensor's output and sets the code when the measured current exceeds the expected range for the operating conditions.

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.