Genuine OEM Volkswagen Toothed Belt Pulley, part number 028130111A. This pulley is a crucial component within the engine's timing system, responsible for maintaining the correct synchronization between the crankshaft and camshaft via the toothed belt. Proper functioning of this pulley is vital for accurate valve timing and overall engine performance. Genuine OEM pulleys are manufactured to precise tolerances, ensuring correct tooth engagement with the belt and smooth bearing operation, which is critical for preventing premature belt wear and maintaining engine timing accuracy.