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Home >> Kia >> 2020 >> Optima EX >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - 1.6L (Except HEV) >> Engine Coolant Temperature Sensor (ECTS) >> Repair Procedures >> Removal
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Repair Procedures: Removal

  1. Turn the ignition switch OFF and disconnect the battery negative (-) terminal.
  2. Remove the battery.

    (Refer to Engine Electrical System - "BATTERY ")

  3. Remove the air cleaner assembly and air intake hose.

    (Refer to Engine Mechanical System - "AIR CLEANER ")

  4. Remove the engine wiring.
    1. Disconnect the OCV connector (A) and EWGA extension connector (B).
      G12915395Courtesy of KIA MOTORS AMERICA, INC.
    2. Remove the engine wiring mounting bolts and then remove the engine wiring harness (A).
    G12915396Courtesy of KIA MOTORS AMERICA, INC.
  5. Remove the vacuum pipe mounting bolts and make a gap by moving the bracket.
  6. Disconnect the engine coolant temperature sensor connector.
  7. Remove the engine coolant temperature sensor (A).
    G12915397Courtesy of KIA MOTORS AMERICA, INC.
    CAUTION: Note that engine coolant may be flowed out from the water temperature control assembly when removing the sensor.
  8. Fill with engine coolant.

    (Refer to Engine Mechanical System - "COOLANT ")

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