Bosch Engine Coolant Temperature Sensor

The Bosch Engine Coolant Temperature Sensor (also called a coolant temp sensor, ECT sensor, or water temperature sensor) monitors engine coolant temperature and sends that data to the engine control unit (ECU). The ECU uses the signal to manage fuel injection, ignition timing, idle speed, and cooling fan operation. It also uses it to drive the dash temperature gauge or warning light.

Key Features:

• Temperature-sensitive thermistor element that changes resistance as coolant temperature changes
• Gives the ECU accurate readings for cold starts, warm-up, and normal operating conditions
• Made to Bosch quality standards, a brand known for OE-supplied automotive electronics and sensors
• Sealed housing and connector designed to resist heat, vibration, and automotive fluids
• Direct-fit replacement design for simple installation

Why Replace It: A failing coolant temperature sensor can cause hard starting, rough idle, poor fuel economy, black smoke, overheating, erratic temperature gauge readings, cooling fan problems, or a check engine light. Replacing a faulty sensor helps restore proper fuel mixture control, drivability, and engine protection.

Select the correct variant from the options on this page to match your application.