|P0138 – O2 Circuit High Voltage (Bank 1, Sensor 2)|
|P0137 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)|
|Description: The powertrain control module (PCM) monitors the heated oxygen sensor (HO2S) for a circuit concern. This DTC sets when the PCM detects a concern with the circuit used to determine the oxygen content in the exhaust gas.
Possible Causes: • HO2S circuit open
• HO2S circuit short to ground
• Damaged HO2S sensor