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DTC codes / P2Axx · Hybrid propulsion / P2A3D

P2A3DO2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3

P2A3D indicates that the powertrain control module has detected an abnormally high current on the negative control circuit for the downstream oxygen sensor on bank 1, which is sensor 3. The sensor's heater or signal return circuit is drawing more current than expected, often due to a short to voltage or a faulty sensor.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

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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