How do coolant sensors work

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A drop down menu will appear. Select the option to run ads for autoblog. The engine temperature sensor is a type of sensor that changes its resistance with temperature. Many critical engine functions such as selection of air-fuel ratio, fuel injection timing, ignition timing etc. This is because a cold engine requires a rich air-fuel mixture; whereas the engine running at optimum operating temperature requires a lean mixture. The data from the engine temperature sensor provides readings for engine temperature gauge on the dashboard.

Engine Coolant Temperature sensor is primarily located in the coolant passage of the liquid cooled engine ; typically near the thermostat valve. The engine temperature sensor connects either to the temperature gauge or to the temperature indicator in the dashboard.

In modern cars, you will notice that there is no separate engine temperature gauge. If in any doubt about which component is faulty beneath the bonnet, take your car to a professional mechanic for a complete diagnosis. Replacing a coolant temperature sensor is a simple process for anyone who is familiar with the components of an engine, and can be done right on your drive.

The steps below demonstrate how to change a faulty coolant temperature sensor in your car. The CTS is normally towards the front of the engine, near the radiator or thermostat housing. Do this carefully, as the plastic connector and wiring can often be brittle and will need completely replacing if it breaks. Coolant sensors are fitted like a spark plug, so you need to unscrew it to remove it.

Using a deep socket and ratchet, carefully loosen the sensor in an anticlockwise direction, without applying too much pressure. A squirt of release spray can help free up stuck sensors. Skip to Main Content. Ask an Expert. You May Also Like. Vehicle Maintenance Tips. Newsletter email Subscribe Subscribe to mailing list.