DTC codes / P2Bxx · Hybrid propulsion / P2B8B
P2B8B indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the heater control circuit for the bank 1 intake air oxygen sensor. This sensor, often called the intake air O2 sensor, is used to monitor oxygen content in the intake tract on certain engine designs, and its heater is needed for accurate readings soon after startup.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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