O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
The engine computer is seeing too much voltage from the rear oxygen sensor on bank 2. This usually means the sensor is stuck rich, the wiring is damaged, or the sensor has failed. It can also be caused by an exhaust leak or an engine running too rich.
The vehicle may still run, but fuel economy and emissions can suffer. If the engine is running rich or the check engine light is flashing, avoid driving until it is diagnosed.
P0158 means the powertrain control module has detected a high-voltage condition on the oxygen sensor circuit for Bank 2 Sensor 2, the downstream sensor after the catalytic converter on the bank opposite cylinder 1. The signal is staying above the expected range for too long, which suggests a sensor, wiring, exhaust, or fuel mixture problem rather than normal switching.
It is the oxygen sensor located after the catalytic converter on the side of the engine that does not contain cylinder 1.
Yes. A failed rear oxygen sensor is one of the most common causes of P0158.
No. If the underlying fault is still present, the code will usually return.
Yes. If the engine is running too rich, the downstream oxygen sensor can show a constant high voltage.