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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 >> Exhaust Seal Replacement (RPO LFA) >> Removal Procedure

Removal Procedure

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    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 heated oxygen (HO2S) sensors. 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: 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 Catalytic Converter To Exhaust Manifold Nuts & Exhaust Seals
    GM1708626Courtesy of GENERAL MOTORS CORP.
  11. Remove the catalytic converter to exhaust manifold nuts (1).
  12. Separate the catalytic converter assembly from the exhaust manifolds.
  13. Lower the catalytic converter assembly using the adjustable jack.
  14. Remove the exhaust seal (2 or 3) as required.
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