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Front Oxygen (A/F) Sensor: Removal

  1. Disconnect the ground cable from battery.
  2. Remove the radiator sub fan and fan motor assembly. < Ref. to REMOVAL , Radiator Sub Fan and Fan Motor. >
  3. Lift up the vehicle.
  4. Remove the under cover. < Ref. to REMOVAL , Front Under Cover. >
  5. Disconnect the connector on the front oxygen (A/F) sensor from the engine harness, and remove the clip (A) securing the front oxygen (A/F) sensor harness to the water pump cover.
    Fig 1: Locating Front Oxygen (A/F) Sensor Connector
    G09479772Courtesy of SUBARU OF AMERICA, INC.
  6. Apply spray-type lubricant to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
  7. 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 2: Locating Front Oxygen (A/F) Sensor
    G09479773Courtesy of SUBARU OF AMERICA, INC.
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