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Home >> Buick >> 2009 >> Lucerne Super >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Removal Procedure

Removal Procedure

NOTE: Servicing of the mufflers, resonator or pipe requires the replacement of the exhaust system as a complete assembly.
    Fig 1: View Of HO2S Electrical Connector
    GM1665113Courtesy of GENERAL MOTORS CORP.
  1. Remove the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
  2. Remove the connector position assurance (CPA) retainer.
  3. Disconnect the heated oxygen sensor (HO2S) electrical connector.
    4. Fig 2: Identifying HO2S
    GM1670531Courtesy of GENERAL MOTORS CORP.
  4. Remove the HO2S.
    5. Fig 3: Identifying Muffler & Rear Exhaust Manifold Pipe Nuts
    GM1670482Courtesy of GENERAL MOTORS CORP.
  5. Remove the muffler to exhaust manifold pipe nuts.
  6. Suitably support the exhaust system.
    7. Fig 4: View Of Exhaust Hanger To Rear Suspension Support Bracket Bolt
    GM1670483Courtesy of GENERAL MOTORS CORP.
  7. Remove the exhaust hanger to the rear suspension support bracket bolts.
    8. Fig 5: Identifying Exhaust System Mounting Points
    GM1688299Courtesy of GENERAL MOTORS CORP.
  8. Remove the rear exhaust hanger bracket to the rear compartment side rail bolts (1).
  9. With the aid of an assistant, lower and remove the exhaust system.
  10. Remove and discard the muffler to exhaust manifold pipe gasket.
    11. Fig 6: Identifying Rear Exhaust System Hanger Bracket Nuts
    GM1688768Courtesy of GENERAL MOTORS CORP.
  11. Remove the rear exhaust hanger to hanger bracket nuts.
  12. Remove the rear exhaust hanger brackets.
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