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Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Intake / Exhaust System - Service Information >> Exhaust Manifold >> Removal [03/2022 - ] >> Procedure

Removal [03/2022 - ]: Procedure

  1. REMOVE NO. 2 ENGINE UNDER COVER ASSEMBLY 

    Refer to PROCEDURE - Step 1

  2. REMOVE ENGINE UNDER COVER HEAT INSULATOR 

    Refer to PROCEDURE - Step 4

  3. REMOVE FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst) 
    WARNING:
    • To prevent burns, do not touch the engine, exhaust pipe or other high temperature components while the engine is hot.
    1. GTY1077864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE HOOD TO FRONT FENDER SEAL LH 
  5. REMOVE HOOD TO FRONT FENDER SEAL RH 
  6. REMOVE WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY 

    Refer to REMOVAL [11/2021 - ]

  7. REMOVE COWL VENTILATOR SPLASH SHIELD LH 

    Refer to PROCEDURE - Step 7 [11/2021 - 03/2024] , or refer to PROCEDURE - Step 7 [03/2024 - ]

  8. REMOVE COWL VENTILATOR PANEL SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 8 [11/2021 - 03/2024] , or refer to PROCEDURE - Step 8 [03/2024 - ]

  9. REMOVE AIR FUEL RATIO SENSOR (for Sensor 1) 
    Refer to REMOVAL [11/2021 - ]
  10. REMOVE WIRING HARNESS CLAMP BRACKET 
    WARNING:
    • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
    1. GTY1077866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. SEPARATE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR 
    WARNING:
    • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
    1. Type A:
      GTY1074194Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Type B:
      GTY1131595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. SEPARATE NO. 1 FRONT FLOOR HEAT INSULATOR 
    WARNING:
    • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
    1. GTY1066269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. REMOVE MANIFOLD STAY 
    WARNING:
    • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
    1. GTY1080169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. SEPARATE NO. 2 WATER BY-PASS PIPE SUB-ASSEMBLY 
    1. GTY1066282Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. SEPARATE FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY) 
    1. GTY1066286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. REMOVE EXHAUST MANIFOLD (TWC: Front Catalyst) 
    WARNING:
    • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
    1. GTY1079398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Front Floor Heat Insulator *2 No. 1 Exhaust Manifold Heat Insulator
      *3 Exhaust Manifold (TWC: Front Catalyst) - -
      1. Remove the 7 nuts and separate the exhaust manifold (TWC: Front Catalyst) from the cylinder head sub-assembly.
      2. Remove the No. 1 front floor heat insulator, No. 1 exhaust manifold heat insulator and exhaust manifold (TWC: Front Catalyst).
  17. REMOVE EXHAUST MANIFOLD TO HEAD GASKET 
    1. GTY999438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR 
    1. Type A:
      GTY1074221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Type B:
      GTY1131598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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