What does code P2ABF mean?

Q: What does code P2ABF mean?

Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 1. P2ABF indicates that the engine control module has detected an open circuit or abnormal reference voltage on the signal circuit for the intake air oxygen sensor on bank 1. This sensor, often a wideband air-fuel ratio sensor mounted in the intake tract, provides critical feedback for fuel control, and the code sets when the voltage on its reference line falls outside the expected range.

DTC codes / P2Axx · Hybrid propulsion / P2ABF

P2ABFIntake Air O2 Sensor Reference Voltage Circuit/Open Bank 1

P2ABF indicates that the engine control module has detected an open circuit or abnormal reference voltage on the signal circuit for the intake air oxygen sensor on bank 1. This sensor, often a wideband air-fuel ratio sensor mounted in the intake tract, provides critical feedback for fuel control, and the code sets when the voltage on its reference line falls outside the expected range.

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.