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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Exhaust) >> Repair Instructions >> Catalytic Converter Replacement (4.8L and 5.3L Engines) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Transmission Mount Nuts
    GM647997Courtesy of GENERAL MOTORS CORP.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Support the transmission with a suitable transmission jack.
  3. Remove the transmission mount to transmission support nuts.
  4. Raise the transmission off of the transmission support.
    5. Fig 2: View Of Transmission Crossmember
    GM702036Courtesy of GENERAL MOTORS CORP.
  5. Remove the transmission support crossmember bolts and nuts.
  6. Remove the transmission support crossmember.
    7. Fig 3: View Of O2 Sensor Harness Routing And Harness Mounting Brackets
    GM664828Courtesy of GENERAL MOTORS CORP.
  7. Remove the clip from around the engine harness and the oxygen sensor pigtail.
  8. Disconnect the connector position assurance (CPA) retainers.
  9. Disconnect the oxygen sensor electrical connectors.
    10. Fig 4: View Of O2 Sensor Harness Routing
    GM664951Courtesy of GENERAL MOTORS CORP.
  10. Unclip the oxygen sensor electrical connectors from the following:
    • Hose clip
    • Transmission crossmember
  11. Disconnect the CPA retainers.
  12. Disconnect the oxygen sensor electrical connectors (1, 2).
    13. Fig 5: View Of Left Exhaust Manifold Pipe & Nuts
    GM858550Courtesy of GENERAL MOTORS CORP.
  13. Remove the left exhaust manifold pipe nuts.
    14. Fig 6: View Of Right Exhaust Pipe Nuts
    GM858553Courtesy of GENERAL MOTORS CORP.
  14. Remove the right exhaust manifold pipe nuts.
    15. Fig 7: View Of Exhaust Muffler Nuts
    GM664840Courtesy of GENERAL MOTORS CORP.
  15. Remove the exhaust muffler nuts.
  16. Remove the catalytic converter.
    17. Fig 8: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
  17. Remove the oxygen sensors if the catalytic converter is to be replaced.
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