Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2009 Toyota Yaris S, 4D HatchbackFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature Sensor: Removal

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
DRAIN ENGINE COOLANT (See REPLACEMENT )
REMOVE ENGINE COOLANT TEMPERATURE SENSOR
1. Disconnect the engine coolant temperature sensor connector.
  
  Fig 1: Locating Engine Coolant Temperature Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using SST, remove the engine coolant temperature sensor.
  SST 09817-33190
  
  Fig 2: Locating Engine Coolant Temperature Sensor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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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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