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

Installation Procedure

  1. GM5001113Courtesy of GENERAL MOTORS COMPANY

    Exhaust System Seal-Right Side (1) - Install NEW

  2. GM5001105Courtesy of GENERAL MOTORS COMPANY

    Exhaust System Seal-Left Side (1) - Install NEW

  3. GM5001076Courtesy of GENERAL MOTORS COMPANY

    Three-Way Catalytic Converter (1) - Install

  4. GM4974120Courtesy of GENERAL MOTORS COMPANY

    Transmission Support Crossmember (1) - Install

  5. GM4974118Courtesy of GENERAL MOTORS COMPANY

    Transmission Support Crossmember Bolt (2) - Install [ 4x ]

  6. CAUTION:

    Refer to Fastener Caution .

  7. Transmission Support Crossmember Nut (1) - Install and tighten [ 4x ] - Fastener Specifications
  8. GM4974116Courtesy of GENERAL MOTORS COMPANY

    Transmission Mount Nut (1) - Install and tighten - Fastener Specifications

  9. GM5565710Courtesy of GENERAL MOTORS COMPANY

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

  10. GM5584486Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut- Right Side (1) - Install and tighten [ 3x ] - Fastener Specifications 

  11. GM5584496Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut- Left Side (1) - Install and tighten [ 3x ] - Fastener Specifications 

  12. GM5001054Courtesy of GENERAL MOTORS COMPANY

    Exhaust Muffler (2) @ Three-Way Catalytic Converter (3) - Connect

  13. Exhaust Pipe Clamp (1) - Tighten - Fastener Specifications 
  14. GM5508826Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Heat Shield (2) - Install

  15. Exhaust Heat Shield Bolt (1) - Install and tighten - Fastener Specifications 
  16. GM5508824Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Heat Shield (2) - Install

  17. Exhaust Heat Shield Bolt (1) - Install and tighten - Fastener Specifications 
  18. GM5523023Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    A special anti-seize compound is used in the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before reinstallation. Adhesives, Fluids, Lubricants, and Sealers

    Install and tighten the heated oxygen sensor bank 2 sensor 2 (1) using a suitable tool. Fastener Specifications

  19. Electrical Connector @ Heated Oxygen Sensor Bank 2 Sensor 2 - Connect
  20. GM5568855Courtesy of GENERAL MOTORS COMPANY

    Install and tighten the heated oxygen sensor bank 2 sensor 1 (1) using a suitable tool. Fastener Specifications

  21. Electrical Connector @ Heated Oxygen Sensor Bank 2 Sensor 1 - Connect
  22. GM5523087Courtesy of GENERAL MOTORS COMPANY

    Install and tighten the heated oxygen sensor bank 1 sensor 2 (1) using a suitable tool. Fastener Specifications

  23. Electrical Connector @ Heated Oxygen Sensor Bank 1 Sensor 2 - Connect
  24. GM5525401Courtesy of GENERAL MOTORS COMPANY

    Install and tighten the heated oxygen sensor bank 1 sensor 1 (1) using a suitable tool. Fastener Specifications

  25. Electrical Connector @ Heated Oxygen Sensor Bank 1 Sensor 1 - Connect
  26. Front Wheelhouse Liner- Left Side and Right Side - Install - Front Wheelhouse Liner Replacement
  27. Inspect the exhaust system for leaks.