Genuine OEM Volkswagen Coolant Temperature Sensor, part number 079919523B. This sensor plays a vital role in engine management by accurately measuring the temperature of the engine coolant. The data it provides is used by the engine control unit to adjust fuel delivery, ignition timing, and cooling fan operation. Typically located within the engine's cooling system, it is a small, lightweight component weighing approximately 0.012 kg. Using a genuine OEM sensor ensures precise temperature readings and proper engine operation, preventing overheating and optimizing efficiency.