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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Engine Mechanical >> Exhaust System >> Repair Instructions >> Three-Way Catalytic Converter Replacement >> Removal Procedure

Removal Procedure

  1. Front Wheelhouse Liner- Left Side and Right Side - Remove - Front Wheelhouse Liner Replacement
  2. GM5508824Courtesy of GENERAL MOTORS COMPANY

    Exhaust Heat Shield Bolt (1) - Remove

  3. Exhaust Front Pipe Heat Shield (2) - Remove
  4. GM5508826Courtesy of GENERAL MOTORS COMPANY

    Exhaust Heat Shield Bolt (1) - Remove

  5. Exhaust Front Pipe Heat Shield (2) - Remove
  6. GM5525401Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.

    WARNING:

    Avoid contact with HOT components. Wear safety glasses and protective gloves to avoid personal injury.

    NOTE:
    • The heated oxygen sensor in-line connector and louvered end MUST be kept clear of all grease, dirt, and other contaminants. Do NOT use cleaning solvents of any type. Do NOT drop or roughly handle the sensor.
    • The heated oxygen sensor MAY be difficult to remove when the engine temperature is less than 48°C (120°F).

    Electrical Connector @ Heated Oxygen Sensor Bank 1 Sensor 1 - Disconnect

  7. Remove the heated oxygen sensor bank 1 sensor 1 (1) using a suitable tool.
  8. GM5523087Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector @ Heated Oxygen Sensor Bank 1 Sensor 2 - Disconnect

  9. Remove the heated oxygen sensor bank 1 sensor 2 (1) using a suitable tool.
  10. GM5568855Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector @ Heated Oxygen Sensor Bank 2 Sensor 1 - Disconnect

  11. Remove the heated oxygen sensor bank 2 sensor 1 (1) using a suitable tool.
  12. GM5523023Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector @ Heated Oxygen Sensor Bank 2 Sensor 2 - Disconnect

  13. Remove the heated oxygen sensor bank 2 sensor 2 (1) using a suitable tool.
  14. GM5001054Courtesy of GENERAL MOTORS COMPANY

    Exhaust Pipe Clamp (1) - Loosen

  15. Exhaust Muffler (2) @ Three-Way Catalytic Converter (3) - Separate
  16. GM5584496Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut-Left Side (1) - Remove [ 3x ]

  17. GM5584486Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut-Right Side (1) - Remove [ 3x ]

  18. Support the transmission with a suitable jack.
  19. GM5565710Courtesy of GENERAL MOTORS COMPANY

    { If equipped } Wiring Harness (2) @ Wiring Harness Retainer (1) - Remove [ 3x ]

  20. GM4974116Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount Nut (1) - Remove

  21. GM4974118Courtesy of GENERAL MOTORS COMPANY

    Transmission Support Crossmember Nut (1) - Remove [ 4x ]

  22. Transmission Support Crossmember Bolt (2) - Remove [ 4x ]
  23. GM4974120Courtesy of GENERAL MOTORS COMPANY

    Transmission Support Crossmember (1) - Remove

  24. GM5001076Courtesy of GENERAL MOTORS COMPANY

    Three-Way Catalytic Converter (1) - Remove

  25. GM5001105Courtesy of GENERAL MOTORS COMPANY

    Exhaust System Seal-Left Side (1) - Remove and DISCARD

  26. GM5001113Courtesy of GENERAL MOTORS COMPANY

    Exhaust System Seal-Right Side (1) - Remove and DISCARD