What does code P2249 mean?

Q: What does code P2249 mean?

O2 Sensor Reference Voltage Circuit Low (Bank 2 Sensor 1). P2249 means the engine computer (PCM) has detected that the reference voltage circuit for the upstream oxygen sensor on bank 2 is lower than expected. The PCM supplies a steady reference voltage to the sensor's signal circuit, and a low reading on that circuit tells the computer the sensor or its wiring is not receiving the proper voltage.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P2249

P2249O2 Sensor Reference Voltage Circuit Low (Bank 2 Sensor 1)

P2249 means the engine computer (PCM) has detected that the reference voltage circuit for the upstream oxygen sensor on bank 2 is lower than expected. The PCM supplies a steady reference voltage to the sensor's signal circuit, and a low reading on that circuit tells the computer the sensor or its wiring is not receiving the proper voltage.

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.