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Home >> Subaru >> 2015 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (STI) >> Rear Oxygen Sensor >> Removal
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Rear Oxygen Sensor: Removal

  1. Disconnect the ground cable from battery.
  2. Lift up the vehicle.
  3. Remove the transmission under cover.
  4. Disconnect the connector from the rear oxygen sensor, and remove the clip (A) holding the rear oxygen sensor harness.
    Fig 1: Locating Rear Oxygen Sensor Connector
    G08538822Courtesy of SUBARU OF AMERICA, INC.
  5. Apply spray-type lubricant to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
  6. Remove the rear oxygen sensor.
    CAUTION: When removing the rear oxygen sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.
    Fig 2: Locating Rear Oxygen Sensor
    G08538823Courtesy of SUBARU OF AMERICA, INC.
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