Genuine OEM Audi Crankshaft Sprocket, part number 03C105209AQ. This critical component is responsible for driving the timing chain or belt directly from the crankshaft, synchronizing engine valve and piston movement. It is located at the end of the crankshaft. Made from high-strength metal, it weighs approximately 0.124 kg. A genuine OEM crankshaft sprocket ensures precise timing, optimal power delivery, and long-term durability, preventing catastrophic engine damage from timing discrepancies.