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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 (LFA) >> Removal Procedure

Removal Procedure

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CAUTION: Refer to Three-Way Catalytic Converter Damage Notice .
    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, if equipped. Refer to Oil Pan Skid Plate Replacement (2500/3500 with RPO NZZ) or Oil Pan Skid Plate Replacement (1500 with RPO NZZ) .
  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. Disconnect the heated oxygen (HO2S) sensor 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 .
    5. Fig 2: View Of Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
    GM1708626Courtesy of GENERAL MOTORS CORP.
  5. Remove the catalytic converter pipe to the exhaust manifold nuts (1).
    6. Fig 3: View Of Catalytic Converter To Muffler Nuts (RPO L92)
    GM1708979Courtesy of GENERAL MOTORS CORP.
  6. Remove the catalytic converter pipe to the resonator pipe nuts.
    7. Fig 4: Band Clamp & Bolt
    GM1972642Courtesy of GENERAL MOTORS CORP.
  7. If equipped with the Norma (band) clamp, remove the band clamp bolt (1).
  8. Remove the catalytic converter pipe from the vehicle.
  9. Remove the exhaust seals (2 and 3) and discard.
    10. Fig 5: View Of Catalytic Converter Assembly HO2S's
    GM1704008Courtesy of GENERAL MOTORS CORP.
  10. Remove the HO2S sensors (1 through 5) from the catalytic converter assembly.
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