P0134 OBD II Trouble Code Oxygen 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)

Symptoms of P0134 OBD II Trouble Code

  • Check engine light illumination
  • Poorly running/engine missing
  • Blowing black smoke
  • Poor fuel economy
  • Dying, stuttering

Common Causes of P0134 OBD II Trouble Code

  • Bad O2 (oxygen) sensor
  • Bad heater circuit in the O2 sensor
  • Wiring or connector to the sensor frayed / broken
  • Blown heater circuit fuse
  • Holes in the exhaust system
  • PCM failure