2006 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Knock Sensor: Removal

CAUTION: Do not allow fuel to spray when removing the pipe between the high pressure side fuel pump and the fuel injectors. The fuel in the pipe is highly pressurized.
  1. REMOVE COOL AIR INTAKE DUCT SEAL (See  REMOVAL  ) 
  2. REMOVE ENGINE ROOM SIDE COVER LH (See  REMOVAL  ) 
  3. REMOVE ENGINE ROOM SIDE COVER RH (See  REMOVAL  ) 
  4. REMOVE V-BANK COVER SUB-ASSEMBLY (See  REMOVAL  ) 
  5. REMOVE FRONT FENDER PROTECTOR UPPER LH (See  REMOVAL  ) 
  6. REMOVE FRONT FENDER PROTECTOR UPPER RH (See  REMOVAL  ) 
  7. REMOVE ROOF DRIP SIDE FINISH MOULDING LH (See  REMOVAL  ) 
  8. REMOVE ROOF DRIP SIDE FINISH MOULDING RH (See  REMOVAL  ) 
  9. REMOVE FRONT WIPER ARM HEAD CAP (See  REMOVAL  ) 
  10. REMOVE WINDSHIELD WIPER ARM AND BLADE ASSEMBLY LH (See  REMOVAL  ) 
  11. REMOVE WINDSHIELD WIPER ARM AND BLADE ASSEMBLY RH (See  REMOVAL  ) 
  12. DISCHARGE FUEL SYSTEM PRESSURE (See  REMOVAL  ) 
  13. DRAIN ENGINE COOLANT (See  COOLANT  ) 
  14. REMOVE NO. 2 VENTILATION HOSE (See  REMOVAL   ) 
  15. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE (See  REMOVAL   ) 
  16. REMOVE THROTTLE BODY (See  REMOVAL   ) 
  17. REMOVE INTAKE AIR SURGE TANK ASSEMBLY (See  REMOVAL  ) 
  18. REMOVE INTAKE MANIFOLD (See  REMOVAL  ) 
  19. REMOVE WATER HOSE JOINT (See  REMOVAL  ) 
  20. REMOVE FUEL PRESSURE PULSATION DAMPER ASSEMBLY (See  REMOVAL  ) 
  21. REMOVE NO. 1 FUEL PIPE (See  REMOVAL  ) 
  22. DISCONNECT NO. 2 FUEL PIPE (See  REMOVAL  ) 
  23. REMOVE FUEL PUMP ASSEMBLY (See  REMOVAL  ) 
  24. REMOVE NO. 2 FUEL PIPE (See  REMOVAL  ) 
  25. REMOVE NO. 3 FUEL PIPE (See  REMOVAL  ) 
  26. REMOVE NO. 2 FUEL DELIVERY PIPE (See  REMOVAL  ) 
  27. REMOVE NO. 1 FUEL DELIVERY PIPE (See  REMOVAL  ) 
  28. REMOVE KNOCK SENSOR 
    1. Disconnect the 2 knock sensor connectors.
    2. Remove the 2 bolts and 2 knock sensors.
      Fig 1: Identifying Knock Sensor
      G04054974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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