What does code P2AF1 mean?

DTC codes / P2Axx · Hybrid propulsion / P2AF1

P2AF1Intake Air O2 Sensor Negative Current Control Circuit High Bank 2

P2AF1 indicates that the engine control module has detected an abnormally high negative current on the control circuit for the intake air oxygen sensor on bank 2. This sensor is used to monitor oxygen content in the intake air path, and the high negative current suggests a short to voltage or a faulty sensor circuit.

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.