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Installation Procedure

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IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from as exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
    Fig 1: View Of Catalytic Converter Assembly HO2S's
    GM1704008Courtesy of GENERAL MOTORS CORP.
  1. If replacing the catalytic converter assembly, perform the following steps, otherwise proceed to step 4.
  2. If reinstalling the old sensors, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
    3. NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
    NOTE: Refer to Fastener Notice .
  3. Install the HO2S's (1-5) to the catalytic converter assembly.

    Tighten:  Tighten the sensors to 42 N.m (31 lb ft).

    4. Fig 2: View Of Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
    GM1708626Courtesy of GENERAL MOTORS CORP.
  4. Install the NEW exhaust seals (2 and 3) as required.
  5. Install the catalytic converter assembly to the muffler.
  6. Install the catalytic converter assembly to the exhaust manifolds.
  7. Install the catalytic converter to exhaust manifold nuts (1).

    Tighten:  Tighten the nuts to 50 N.m (37 lb ft).

  8. Install the HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series) .
    9. Fig 3: View Of Catalytic Converter To Muffler Nuts (RPO L92)
    GM1708979Courtesy of GENERAL MOTORS CORP.
  9. If the vehicle is equipped with RPO L92, install the muffler to catalytic converter nuts.

    Tighten:  Tighten the nuts to 45 N.m (33 lb ft).

    10. Fig 4: View Of Catalytic Converter To Muffler Nuts
    GM1708705Courtesy of GENERAL MOTORS CORP.
  10. If the vehicle is equipped with RPOs LC9/LMG/LY5/L76/LY2, install the catalytic converter to muffler nuts.

    Tighten:  Tighten the nuts to 45 N.m (33 lb ft).

    11. Fig 5: View Of Left Front HO2S Electrical Connector Clip & Engine Wiring Harness Electrical Connector
    GM1704004Courtesy of GENERAL MOTORS CORP.
  11. For vehicles equipped with a 4L60-E/4L70-E automatic transmission perform the following steps, for vehicles equipped with a 6L80-E automatic transmission proceed to step 13.
  12. Install the HO2S electrical connector clip (1) to the fuel line clip.
  13. Connect the engine wiring harness electrical connector (2) to the HO2S.
  14. Install the CPA retainer.
    15. Fig 6: View Of Engine Wiring Harness Electrical Connector Clip & Electrical Connector
    GM1704002Courtesy of GENERAL MOTORS CORP.
  15. Connect the engine wiring harness electrical connector (3) to the HO2S.
  16. Install the engine wiring harness electrical connector clip (1) to the fuel line clip.
  17. Install the CPA retainer (2).
    18. Fig 7: View Of Left Rear CPA Retainer & Engine Wiring Harness Electrical Connector
    GM1704005Courtesy of GENERAL MOTORS CORP.
  18. Connect the left rear HO2S electrical connector to the engine wiring harness electrical connector (3).
  19. Install the left rear CPA retainer (1).
    20. Fig 8: View Of Engine Wiring Harness Electrical Connectors, (CPA) Retainers & Engine Harness Clips
    GM1704006Courtesy of GENERAL MOTORS CORP.
  20. Install the right rear HO2S electrical connector clip to the engine harness clip (5).
  21. Connect the engine wiring harness electrical connector (3) to the right rear HO2S electrical connector.
  22. Install the right rear CPA retainer (4).
  23. Connect the right front HO2S electrical connector to the engine wiring harness electrical connector (1).
  24. Install the right front CPA retainer (2).
    25. Fig 9: View Of Oil Pan Skid Plate & Bolts
    GM1698082Courtesy of GENERAL MOTORS CORP.
  25. Install the transmission crossmember. Refer to Crossmember Replacement - Transmission (C1500 Series) or Crossmember Replacement - Transmission (C2500 Series) or Crossmember Replacement - Transmission (K1500 Series) or Crossmember Replacement - Transmission (K2500 series) .
  26. Position the oil pan skid plate and install the oil pan skid plate bolts, if equipped.

    Tighten:  Tighten the bolts to 28 N.m (21 lb ft).

  27. Lower the vehicle.
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