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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1342 (ENGINE CONTROL SYSTEM (INTRODUCTION) - 1.8L (LV6))REPAIR INSTRUCTIONSHEATED OXYGEN SENSOR REPLACEMENT - POSITION 2 (AWD)INSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The HO2S 2 comes with an anti-seize coating on the new sensor. Take precautions in order to prevent removal of any of this coating prior to installation.
    Fig 1: HO2S 2, Wiring Pigtail And Body Plug (AWD)
    GM851409Courtesy of GENERAL MOTORS CORP.
  1. Install the HO2S 2 (1) into the exhaust pipe.
    2. NOTE: Refer to Component Fastener Tightening Notice in Cautions and Notices.
  2. Tighten the HO2S 2.

    Tighten:  Tighten the HO2S 2 to 44 N.m (32 lb ft).

  3. Install the HO2S 2 wiring pigtail and body plug (2) into the floor pan.
  4. Lower the vehicle.
    5. Fig 2: HO2S 2 Wiring Pigtail And Harness Connector (AWD)
    GM851408Courtesy of GENERAL MOTORS CORP.
  5. Connect the HO2S 2 wiring pigtail (2) to the HO2S harness connector (1).
  6. Relocate the carpet under the seat and the left sill plate area.
  7. Install the door sill plate and carpet trim.
  8. Install the front seat assembly. Refer to Seat Replacement - Front Bucket in Seats.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.