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Home >> Hummer >> 2005 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Catalytic Converter Replacement >> Removal Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the catalytic converter guard. Refer to Catalytic Converter Guard Replacement in Frame and Underbody.
    3. Fig 1: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the connector position assurance (CPA) retainers.
  4. Disconnect the oxygen sensor electrical connectors (1, 2).
  5. Remove the catalytic converter to muffler flange nuts.
    6. Fig 2: Exhaust Manifold Pipe Nuts (Left)
    GM309165Courtesy of GENERAL MOTORS CORP.
  6. Remove the left exhaust manifold pipe nuts.
    7. Fig 3: Exhaust Manifold Pipe
    GM863015Courtesy of GENERAL MOTORS CORP.
  7. Remove the catalytic converter.
    8. Fig 4: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
  8. Remove the oxygen sensors if the catalytic converter is to be replaced.
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