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Home >> Subaru >> 2009 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (STI) >> Front Oxygen (A/F) Sensor >> Removal

Front Oxygen (A/F) Sensor: Removal

  1. Set the vehicle on a lift.
  2. Disconnect the ground cable from battery.
    Fig 1: Identifying Battery Ground Cable
    G05019586Courtesy of SUBARU OF AMERICA, INC.
  3. Disconnect the connector from the front oxygen (A/F) sensor, and remove the clip (A) holding the return hose and front oxygen (A/F) sensor harness.
    Fig 2: Locating Front Oxygen (A/F) Sensor Connector And Clip
    G05954846Courtesy of SUBARU OF AMERICA, INC.
  4. Remove the clips (A) holding the front oxygen (A/F) sensor harness to the engine harness stay.
    Fig 3: Identifying Front Oxygen (A/F) Sensor Harness To Engine Harness Stay And Clips
    G06344722Courtesy of SUBARU OF AMERICA, INC.
  5. Lift up the vehicle.
  6. Remove the under cover.
  7. Apply spray-type lubricant to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
  8. Remove the front oxygen (A/F) sensor.
    CAUTION: When removing the front oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.
    Fig 4: Identifying Front Oxygen (A/F) Sensor
    G06344723Courtesy of SUBARU OF AMERICA, INC.
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