Genuine OEM Volkswagen Timing Chain, part number 03H109503B. This timing chain is a critical component in the engine's timing system, responsible for maintaining the precise synchronization between the crankshaft and camshaft. Proper timing is essential for efficient combustion and overall engine performance. Located within the engine's timing assembly. Constructed from robust materials to withstand the demanding conditions of engine operation. Genuine OEM timing chains are engineered to meet strict tolerances, ensuring reliable operation and preventing potential engine damage due to incorrect timing.