2012 Lexus IS 250 Base, RWD, StandardFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature Sensor: Removal: Removal

  1. REMOVE COOL AIR INTAKE DUCT SEAL  . Refer to REMOVAL - Step 1
  2. REMOVE ENGINE ROOM SIDE COVER LH  . Refer to REMOVAL - Step 2
  3. REMOVE ENGINE ROOM SIDE COVER RH  . Refer to REMOVAL - Step 3
  4. REMOVE V-BANK COVER SUB-ASSEMBLY  . Refer to REMOVAL - Step 4
  5. REMOVE FRONT FENDER PROTECTOR UPPER LH  . Refer to REMOVAL - Step 4
  6. REMOVE FRONT FENDER PROTECTOR UPPER RH  . Refer to REMOVAL - Step 6
  7. REMOVE ROOF DRIP SIDE FINISH MOULDING LH  . Refer to REMOVAL - Step 1
  8. REMOVE ROOF DRIP SIDE FINISH MOULDING RH  . Refer to REMOVAL - Step 8
  9. REMOVE FRONT WIPER ARM HEAD CAP  . Refer to REMOVAL - Step 8
  10. REMOVE WINDSHIELD WIPER ARM AND BLADE ASSEMBLY LH  . Refer to REMOVAL - Step 9
  11. REMOVE WINDSHIELD WIPER ARM AND BLADE ASSEMBLY RH  . Refer to REMOVAL - Step 10
  12. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY  . Refer to REMOVAL - Step 11
  13. DRAIN ENGINE COOLANT  . Refer to ON-VEHICLE INSPECTION - Step 4
  14. DISCONNECT NO. 2 VENTILATION HOSE  See step  5
  15. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE  See step  6
  16. REMOVE THROTTLE BODY  See step  7
  17. REMOVE COLD START INJECTOR  . Refer to REMOVAL - Step 4
  18. REMOVE INTAKE AIR SURGE TANK ASSEMBLY  . Refer to REMOVAL - Step 20
  19. REMOVE INTAKE MANIFOLD  . Refer to REMOVAL - Step 21
  20. REMOVE ENGINE COOLANT TEMPERATURE SENSOR 
    1. Disconnect the engine coolant temperature sensor connector.
      Fig 1: Identifying Engine Coolant Temperature Sensor & Connector
      GTY104618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the engine coolant temperature sensor.
    3. Remove the gasket from the engine coolant temperature sensor.
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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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