This product is a genuine VW / Audi engine coolant temperature sensor with the part number 079919525M. It is used to measure the temperature of the engine coolant and send this information to the vehicle's engine control unit. This sensor is an important component in the engine's cooling system, helping to regulate the engine's temperature and prevent overheating. It is designed specifically for use in VW and Audi vehicles and is a reliable and high-quality replacement part for your car.