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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Engine Mechanical >> Exhaust System >> Repair Instructions >> Exhaust Front Hanger Replacement >> Installation Procedure

Installation Procedure

  1. GM5185060Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Hanger (2) @ Exhaust Front Bracket (3) - Install

  2. Exhaust Hanger Bracket Nut (1) - Install and tighten - Fastener Specifications 
  3. GM5185017Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Bracket (2) - Install

  4. CAUTION:

    Refer to Fastener Caution .

  5. Catalytic Converter Brace Bracket Bolt (1) - Install and tighten [ 2x ] - Fastener Specifications 
  6. GM5607934Courtesy of GENERAL MOTORS COMPANY

    Position the wiring harness (2) in place and install the wring harness retainer (1) to the exhaust front bracket.

  7. GM5184846Courtesy of GENERAL MOTORS COMPANY

    Exhaust System Front Gasket (2) - Install NEW

  8. Nitrogen Oxides Catalytic Converter (1) - Install
  9. GM5341378Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut (1) - Install and tighten [ 2x ] - Fastener Specifications 

  10. GM5634664Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Brace Bracket (3) - Install

  11. Wiring Harness Retainer (2) @ Catalytic Converter Brace Bracket (3) - Install
  12. Catalytic Converter Brace Bracket Nut (1) - Install and tighten [ 2x ] - Fastener Specifications 
  13. GM5340362Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut (1) - Install and tighten [ 2x ] - Fastener Specifications 

  14. GM5341429Courtesy of GENERAL MOTORS COMPANY

    Exhaust Pipe Clamp (1) - Tighten - Fastener Specifications 

  15. GM5151789Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Coat the threads with anti-seize compound. Adhesives, Fluids, Lubricants, and Sealers

    Exhaust Particulate Sensor (1) - Install and tighten - Fastener Specifications

  16. GM5150652Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Coat the threads with anti-seize compound. Adhesives, Fluids, Lubricants, and Sealers

    Nitrogen Oxides Sensor- Position 3 (1) - Install and tighten - Fastener Specifications

  17. GM5149436Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Coat the threads with anti-seize compound. Adhesives, Fluids, Lubricants, and Sealers

    Nitrogen Oxides Sensor- Position 2 (1) - Install and tighten - Fastener Specifications

  18. Front Wheelhouse Liner-Right Side - Install - Front Wheelhouse Liner Replacement
  19. Inspect the exhaust system for leaks.
  20. Perform the catalyst reset procedure. Catalyst Reset
  21. Perform the nitrogen oxides catalyst reductant loading reset procedure. Nitrogen Oxides Catalytic Converter Reductant Loading Reset
  22. Perform the nitrogen oxides catalytic converter reset procedure. Nitrogen Oxides Catalytic Converter Reset