Genuine OEM Volkswagen Chain Sprocket, part number 03P103333A. This sprocket is a critical component of the engine's timing system, engaging with the timing chain to synchronize crankshaft and camshaft rotation. It is located as indicated by number 25 in the provided diagram. Manufactured from hardened steel for maximum durability and wear resistance. Genuine OEM parts are vital for maintaining precise engine timing and ensuring smooth, efficient operation.