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Removal Procedure

CAUTION: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.
CAUTION: Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.
  1. Disconnect the negative battery cable.
  2. Disconnect the Heated Oxygen Sensor (HO2S1) electrical connector.
  3. Remove the following components from the exhaust pipe:
    • 2 oxygen sensor nuts
    • The oxygen sensor gasket
    • The oxygen sensor (2)
  4. Raise and properly support the vehicle.
    Fig 1: Removing Oxygen Sensor
    G01712215Courtesy of GENERAL MOTORS CORP.
  5. Remove the following components from the exhaust manifold flange:
    • 2 bolts
    • The springs
  6. Remove the exhaust gasket.
  7. Remove 1 bolt (1) from the manifold support bracket to exhaust manifold.
  8. Lower the vehicle.
    Fig 2: Removing Bolt From Manifold Support Bracket
    G01712216Courtesy of GENERAL MOTORS CORP.
  9. Remove the 6 upper heat insulator bolts.
  10. Remove the heat insulator.
  11. Remove the 5 exhaust manifold nuts (1).
  12. Remove the following components:
    • The exhaust manifold
    • The gasket
  13. Remove the 3 lower heat insulator bolts.
  14. Remove the lower heat insulator.
    Fig 3: Removing 5 Exhaust Manifold Nuts
    G01712217Courtesy of GENERAL MOTORS CORP.
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