Genuine OEM Audi Engine Chain Sprocket, part number 057105223B. This precision-engineered component is an integral part of the engine's timing system, engaging with the timing chain to accurately transfer rotational motion from the crankshaft to the camshafts. This synchronization is crucial for valve timing and engine operation. Weighing 0.245 kg, it is manufactured to exact tolerances. Choosing a genuine OEM sprocket ensures correct tooth profile, material hardness, and dimensional accuracy, which are vital for reliable engine timing and preventing catastrophic engine damage.