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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 261 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (1500 ) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Oil Pan Skid Plate & Bolts
    GM1698082Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the oil pan skid plate bolts and skid plate, if equipped.
  3. Remove the transmission crossmember. Refer to Transmission Support Crossmember Replacement (4WD 2500 series) or Transmission Support Crossmember Replacement (2WD 1500 series) or Transmission Support Crossmember Replacement (2WD 2500 series) or Transmission Support Crossmember Replacement (4WD 1500 series) .
    4. Fig 2: View Of Engine Wiring Harness Electrical Connectors, (CPA) Retainers & Engine Harness Clips
    GM1704006Courtesy of GENERAL MOTORS CORP.
  4. Remove the right front connector position assurance (CPA) retainer (2).
  5. Disconnect the right front heated oxygen sensor (HO2S) electrical connector from the engine wiring harness electrical connector (1).
  6. Remove the right rear CPA retainer (4).
  7. Disconnect the engine wiring harness electrical connector (3) from the right rear HO2S electrical connector.
  8. Remove the right rear HO2S electrical connector clip from the engine harness clip (5).
    9. Fig 3: View Of Left Rear CPA Retainer & Engine Wiring Harness Electrical Connector
    GM1704005Courtesy of GENERAL MOTORS CORP.
  9. Remove the left rear CPA retainer (1).
  10. Disconnect the left rear HO2S electrical connector from the engine wiring harness electrical connector (3).
    11. Fig 4: 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 15.
  12. Remove the left front CPA retainer.
  13. Disconnect the engine wiring harness electrical connector (2) from the left front HO2S.
  14. Remove the left front HO2S electrical connector clip (1) from the fuel line clip.
    15. Fig 5: View Of Engine Wiring Harness Electrical Connector Clip & Electrical Connector
    GM1704002Courtesy of GENERAL MOTORS CORP.
  15. Remove the left front CPA retainer (2).
  16. Remove the engine wiring harness electrical connector clip (1) from the fuel line clip.
  17. Disconnect the engine wiring harness electrical connector (3) from the left front HO2S.
    18. Fig 6: View Of Catalytic Converter To Muffler Nuts
    GM1708705Courtesy of GENERAL MOTORS CORP.
  18. If the vehicle is equipped with regular productions options (RPOs) LC9/LMG/LY5/L76/LY2, remove the catalytic converter to muffler nuts.
    19. Fig 7: View Of Catalytic Converter To Muffler Nuts (RPO L92)
    GM1708979Courtesy of GENERAL MOTORS CORP.
  19. If the vehicle is equipped with RPO L92, remove the muffler to catalytic converter nuts.
  20. Remove 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) .
    21. Fig 8: View Of Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
    GM1708626Courtesy of GENERAL MOTORS CORP.
  21. Remove the catalytic converter to exhaust manifold nuts (1).
  22. Separate the catalytic converter assembly from the exhaust manifolds.
  23. Remove the catalytic converter assembly from the exhaust muffler.
  24. If replacing the catalytic converter assembly, perform the following steps, otherwise proceed to step 4 in the installation procedure.
  25. Remove the exhaust seals (2 and 3).
    26. Fig 9: View Of Catalytic Converter Assembly HO2S's
    GM1704008Courtesy of GENERAL MOTORS CORP.
  26. Remove the HO2S's (1-5) from the catalytic converter assembly.
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