Genuine OEM Volkswagen Poly-V-Belt, part number 04E145933T. This belt is responsible for driving various engine accessories, including the alternator and air conditioning compressor, from the crankshaft pulley. It is located on the front of the engine, wrapping around multiple pulleys. Genuine OEM belts are constructed with high-quality rubber compounds and reinforced cords to ensure optimal power transmission, resistance to heat and wear, and a long service life.