Genuine OEM Audi Engine Chain Sprocket, part number 07P109077A. This vital component is part of the engine's timing chain system, responsible for transferring rotational motion to synchronize the camshafts with the crankshaft. It is located within the engine's cylinder head assembly. This precision-machined metal sprocket weighs approximately 0.526 kg. Choosing a genuine OEM chain sprocket ensures factory tolerances, correct tooth profile, and material strength, which are critical for maintaining accurate engine timing and preventing catastrophic engine damage.