Bosch Coolant Temperature Sensor

The Bosch Coolant Temperature Sensor (also called an engine coolant temperature sensor, ECT sensor, or water temperature sensor) monitors the temperature of the engine coolant and sends that data to the engine control unit (ECU). The ECU uses the signal to manage fuel injection, ignition timing, idle speed, cooling fan operation, and the temperature gauge reading.

Key Features:

• Uses a temperature-sensitive thermistor element that changes electrical resistance as coolant temperature changes
• Supports accurate fuel metering and ignition control for cold starts, warm-up, and normal driving
• Helps maintain smooth engine performance, fuel efficiency, and emissions control
• Built to meet OE-quality standards for fit, function, and durability
• Designed to resist the heat, vibration, and coolant exposure found in the engine bay

Bosch is a leading global automotive supplier and original equipment manufacturer, known for sensors, fuel systems, ignition components, and electronics. A worn or failing coolant temperature sensor can cause hard starting, rough idle, poor fuel economy, black smoke, overheating, or a check engine light. Replacing it with a quality Bosch sensor helps restore reliable engine management operation.