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Home >> Subaru >> 2006 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection (Fuel Systems) (STI) >> Rear Oxygen Sensor >> Installation
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Rear Oxygen Sensor: Installation

  1. Before installing rear oxygen sensor, apply 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 protector of rear oxygen sensor.

    Anti-seize compound: 

    NEVER-SEEZ NS-165 or equivalent 

  2. Install the rear oxygen sensor.

    Tightening torque: 

    21 N.m (2.1 kgf-m, 15.2 ft-lb) 

    Fig 1: Locating Rear Oxygen Sensor
    G04998403
  3. Connect the connector to the rear oxygen sensor.
    Fig 2: Locating Connector For Rear Oxygen Sensor
    G04998401
  4. Connect the clip to the crossmember.
    Fig 3: Locating Clips
    G04998402
  5. Lower the vehicle.
  6. Connect the battery ground cable to battery.