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Removal Procedure

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  1. Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  2. Unclip the oxygen sensor connector from the frame.
    3. Fig 1: Removing Oxygen Sensor Connector From Frame
    G02119475Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the connector position assurance (CPA) retainer.
  4. Disconnect the oxygen sensor electrical connector.
  5. Unclip the oxygen sensor connector from the support.
  6. Disconnect the CPA retainer.
  7. Disconnect the oxygen sensor electrical connector.
    Fig 2: Removing Oxygen Sensor Electrical Connector
    G02119476Courtesy of GENERAL MOTORS CORP.
  8. Unclip the oxygen sensor connector from the support.
  9. Disconnect the CPA retainer.
    10. Fig 3: Removing CPA Retainer
    G02119477Courtesy of GENERAL MOTORS CORP.
  10. Disconnect the oxygen sensor electrical connector.
  11. If equipped with a 6.0L engine, perform the following:
    • Unclip the oxygen sensor connector from the frame.
      • Fig 4: Removing Oxygen Sensor Connector From Frame (6.0L)
      G02119478Courtesy of GENERAL MOTORS CORP.
    • Disconnect the CPA retainer.
    • Disconnect the oxygen sensor electrical connector.
  12. Remove the exhaust muffler nuts.
    13. Fig 5: Removing Exhaust Muffler Nuts
    G02119479Courtesy of GENERAL MOTORS CORP.
  13. Loosen the exhaust pipe clamp.
  14. With the aid of an assistant, support the exhaust muffler.
  15. Remove the insulators from the frame hangers.
    16. Fig 6: Removing Insulators From Frame Hangers
    G02119480Courtesy of GENERAL MOTORS CORP.
  16. With the aid of an assistant, slide the muffler rearward in order to remove the muffler from the catalytic converter.
  17. Remove the insulators from the muffler hangers.
  18. Remove the exhaust manifold pipe gasket.
  19. Remove the oxygen sensor if the muffler is being replaced.
    20. Fig 7: Removing Muffler Oxygen Sensor
    G02119481Courtesy of GENERAL MOTORS CORP.
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