Genuine OEM Audi Engine Timing Chain Tensioner, part number 079109507AE. This essential engine component is responsible for maintaining the correct tension on the engine timing chain, which is vital for precise valve timing and the smooth, efficient operation of the engine. It is typically located within the engine's timing cover assembly. This tensioner weighs 0.472 kg and features a durable metal body with a low-friction wear surface. Choosing a genuine OEM timing chain tensioner ensures the correct spring rate, hydraulic function, and material quality, preventing chain slack, premature wear, and potential catastrophic engine damage.