How To Fix P0138? | Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2)
What does the P0138 Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2) mean? P0138 code gets triggered when the Engine Control Module detects that the voltage from the oxygen sensor—also known as the air-fuel ratio sensor—has remained too high for too long. This high voltage usually indicates that the sensor is detecting a rich…