P0138 OBD II Trouble Code Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)

Symptoms of P0138 OBD II Trouble Code

  • Faulty O2 sensor
  • Short to battery voltage in O2 sensor signal circuit
  • High fuel pressure (not as likely)

Common Causes of P0138 OBD II Trouble Code

  • Replace O2 sensor
  • Repair short to battery voltage in o2 sensor signal circuit