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.
2008 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE
Engine Coolant Temperature Sensor: Removal
CAUTION:
The hybrid system uses high voltage circuits, so improper handling could cause an electric shock or leakage. During servicing (e.g. installing or removing the parts, replacing the parts), be sure to follow the procedures below.
- REMOVE RADIATOR SUPPORT OPENING COVER (See REMOVAL )
- REMOVE ENGINE UNDER COVER LH
- REMOVE ENGINE UNDER COVER RH
- DRAIN ENGINE COOLANT (See COOLANT )
- DRAIN HV COOLANT (See REPLACEMENT )
- DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
- REMOVE INVERTER WITH CONVERTER
- Remove the inverter with converter (see REMOVAL ).
- REMOVE ENGINE COOLANT TEMPERATURE SENSOR
- Disconnect the sensor connector.
- Using a 19 mm deep socket wrench, remove the sensor and gasket.
Factory Service Tools
Use the Manual With the Right Hardware
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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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