Genuine OEM Volkswagen Timing Chain, part number 06K109158BJ. This timing chain is a crucial engine component that synchronizes the rotation of the crankshaft and camshaft, ensuring precise valve timing. Proper timing is essential for optimal engine performance, fuel efficiency, and emissions control. This part is located within the engine's timing system. Genuine OEM timing chains are manufactured to strict tolerances for durability and reliable operation, preventing potential engine damage.