What does code P22B0 mean?

Q: What does code P22B0 mean?

O2 Sensor Reference Voltage Circuit Low (Bank 1 Sensor 2). P22B0 indicates that the powertrain control module has detected a low voltage condition on the reference voltage circuit for the downstream oxygen sensor on bank 1, which is the sensor after the catalytic converter. The computer expects a steady reference signal, typically around 2.5 to 3.5 volts depending on the design, but the circuit is reporting a value below the acceptable threshold, which can affect the sensor's ability to report accurate exhaust oxygen content.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22B0

P22B0O2 Sensor Reference Voltage Circuit Low (Bank 1 Sensor 2)

P22B0 indicates that the powertrain control module has detected a low voltage condition on the reference voltage circuit for the downstream oxygen sensor on bank 1, which is the sensor after the catalytic converter. The computer expects a steady reference signal, typically around 2.5 to 3.5 volts depending on the design, but the circuit is reporting a value below the acceptable threshold, which can affect the sensor's ability to report accurate exhaust oxygen content.

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.