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Front Oxygen (A/F) Sensor: Installation

  1. Before installing front oxygen (A/F) sensor, apply anti-seize compound only to threaded portion of front oxygen (A/F) sensor to make the next removal easier.

    Anti-seize compound: SS-30 by JET LUBE 

    CAUTION: Never apply anti-seize compound to protector of front oxygen (A/F) sensor.
  2. Install front oxygen (A/F) sensor.

    Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb) 

    Fig 1: Identifying Front Oxygen (A/F) Sensor
    G04987982Courtesy of SUBARU OF AMERICA, INC.
  3. Lower the vehicle.
  4. Connect connector of front oxygen (A/F) sensor.
    Fig 2: Connecting Connector Of Front Oxygen (A/F) Sensor
    G04988429Courtesy of SUBARU OF AMERICA, INC.
  5. Connect battery ground cable.
    Fig 3: Connecting Battery Ground Cable
    G04988132Courtesy of SUBARU OF AMERICA, INC.
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