P0155 OBD II Trouble Code Oxygen O2 Sensor Heater Circuit Malfunction (Bank2, Sensor1)

Symptoms of P0155 OBD II Trouble Code

  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness

Common Causes of P0155 OBD II Trouble Code

  • Repair short or open or high resistance in wiring harness or harness connectors
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)