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Home › Chevrolet › 2017 › SS Automatic Trans › Repair and Diagnosis › Engine Mechanical › Exhaust System › Repair Instructions › Catalytic Converter Replacement - Left Side › Removal Procedure

Removal Procedure

    WARNING:

    Refer to Exhaust Service Warning .

    WARNING:

    Refer to Protective Goggles and Glove Warning .

  1. Ignition OFF.
    2. WARNING:

    Refer to Battery Disconnect Warning .

  2. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
    3. Fig 1: Left Catalytic Converter To Exhaust Manifold Retaining Nuts
    GM1949706Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The left catalytic converter to exhaust manifold retaining nuts (1) are single use parts. They must be discarded after removal.

  3. Remove the left catalytic converter to exhaust manifold retaining nuts (1).

    Discard the nuts.

  4. Disconnect the left catalytic converter (2) from the exhaust manifold (3).
    5. WARNING:

    To avoid any vehicle damage, serious personal injury or death:

    • When major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.
    • When performing work in the engine compartment or under the vehicle, ensure that the hood is fully open, or opened to its secondary latch. When the hood is opened to the secondary latch, the vehicle will disable the remote start features from the key fob and OnStar mobile app. Failure to open the hood, or open the hood to the secondary latch while doing a repair in the engine compartment or under the vehicle can result in inadvertent vehicle starting which could result in personal injury or damage to a vehicle.
  5. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
    6. Fig 2: Left Pre-Catalytic Converter Heated Oxygen Sensor (HO2S) Electrical Connector
    GM1950735Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fuel and Evaporative Emission Hose/Pipe Connection Cleaning Caution

  6. Disconnect the left pre-catalytic converter heated oxygen sensor (HO2S) electrical connector (1).
    7. Fig 3: Intermediate Exhaust Assembly To Left Catalytic Converter Retaining Nuts
    GM1947042Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The exhaust crossover pipe assembly to left catalytic converter retaining nuts (3) are single use parts. They must be discarded after removal.

  7. Remove the exhaust crossover pipe assembly to left catalytic converter retaining nuts (3).

    Discard the nuts.

  8. Disconnect the exhaust crossover pipe assembly (2) from the left catalytic converter (1).
    9. Fig 4: Left Catalytic Converter
    GM1949679Courtesy of GENERAL MOTORS COMPANY
  9. Remove the left catalytic converter (1) from the vehicle.
  10. Remove the left pre-catalytic converter HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 .
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