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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.0L) >> Rear Oxygen Sensor >> Installation
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Rear Oxygen Sensor: Installation

CAUTION: If lubricant is spilt over the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.
  1. Before installing rear oxygen sensor, apply the anti-seize compound only to the threaded portion of rear oxygen sensor to make the next removal easier.
    CAUTION: Never apply anti-seize compound to the protector of rear oxygen sensor.

    Anti-seize compound: 

    NEVER-SEEZ NSN, JET LUBE SS-30 or equivalent

  2. Install the rear oxygen sensor.

    Tightening torque: 

    30 N.m (3.1 kgf-m, 22.1 ft-lb)

    G10266248Courtesy of SUBARU OF AMERICA, INC.
  3. Connect the rear oxygen sensor connector to the engine wiring harness.
    G10266247Courtesy of SUBARU OF AMERICA, INC.
  4. Install the under cover. Refer to EXTERIOR/INTERIOR TRIM>FRONT UNDER COVER>INSTALLATION .
  5. Lower the vehicle.
  6. Connect the ground terminal to battery sensor. Refer to NOTE>NOTE>BATTERY .