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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 1 (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 1 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: Exhaust Manifold And HO2S 1 Electrical Connector (AWD)
    GM851394Courtesy of GENERAL MOTORS CORP.
  1. Install the HO2S 1 (1) into the exhaust manifold (2).
    2. NOTE: Refer to Component Fastener Tightening Notice in Cautions and Notices.
  2. Tighten the HO2S 1.

    Tighten:  Tighten the HO2S 1 to 44 N.m (32 lb ft).

  3. Connect the electrical connector of the HO2S 1.
    4. Fig 2: View Of Engine Top Cover, Plastic Retainers And Fasteners
    GM856569Courtesy of GENERAL MOTORS CORP.
  4. Install the engine cover (1).
  5. Secure the engine cover (1) with the 2 fasteners.

    Tighten:  Tighten the two fasteners to 7 N.m (62 lb in).

  6. Install the 2 plastic retainers.
RENDER: 1.0x

NO RELATED

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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.