What does code P2250 mean?

Q: What does code P2250 mean?

O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1). P2250 indicates the engine computer has detected an abnormally high voltage on the reference voltage circuit for the upstream oxygen sensor on bank 2, which monitors the side of the engine opposite cylinder number one. The computer supplies a precise reference voltage to the sensor's signal circuit and expects a predictable return; a high reading means the circuit is seeing voltage above the expected range, often due to a short to voltage or a sensor fault.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P2250

P2250O2 Sensor Reference Voltage Circuit High (Bank 2 Sensor 1)

P2250 indicates the engine computer has detected an abnormally high voltage on the reference voltage circuit for the upstream oxygen sensor on bank 2, which monitors the side of the engine opposite cylinder number one. The computer supplies a precise reference voltage to the sensor's signal circuit and expects a predictable return; a high reading means the circuit is seeing voltage above the expected range, often due to a short to voltage or a sensor fault.

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.