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What is the coolant temperature sensor on an Audi A2?

I've been having issues with my engine temperature and have heard that it could be due to a faulty coolant temperature sensor. Can someone explain what this sensor does and where it is located in an Audi A2?

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The coolant temperature sensor is responsible for reading the temperature of the engine coolant and sending that information to the engine control unit. It is typically located on or near the engine block.

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