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Home >> Hummer >> 2009 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Mechanical >> Exhaust System >> Repair Instructions >> Catalytic Converter Replacement >> Removal Procedure

Removal Procedure

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the transmission crossmember. Refer to Crossmember Replacement (Lower Control Arm) .
    3. Fig 1: Identifying Catalytic Converter Assembly HO2S's
    GM1704008Courtesy of GENERAL MOTORS CORP.
  3. If replacing the three way catalytic converter remove the heated oxygen (HO2S) sensors (1 - 5) otherwise disconnect the heated oxygen (HO2S) sensors harness connectors. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 , Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 , Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 .
    4. Fig 2: Identifying Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
    GM1708626Courtesy of GENERAL MOTORS CORP.
  4. Remove the catalytic converter pipe to the exhaust manifold nuts (1).
  5. Remove the exhaust seals (2 and 3) and discard.
    6. Fig 3: Identifying Band Clamp Bolt
    GM1936687Courtesy of GENERAL MOTORS CORP.
  6. Loosen the band clamp bolt (1).
  7. Remove the catalytic converter pipe from the vehicle.
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