What does code P22BB mean?

Q: What does code P22BB mean?

O2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 2). P22BB indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage on the reference voltage circuit for the downstream oxygen sensor on bank 2 (Bank 2 Sensor 2). The PCM monitors the sensor's reference voltage line, which should remain at a stable value (typically around 0.45 volts or a dedicated reference voltage), and sets this code when the signal is out of range or missing entirely.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22BB

P22BBO2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 2)

P22BB indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage on the reference voltage circuit for the downstream oxygen sensor on bank 2 (Bank 2 Sensor 2). The PCM monitors the sensor's reference voltage line, which should remain at a stable value (typically around 0.45 volts or a dedicated reference voltage), and sets this code when the signal is out of range or missing entirely.

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.