Genuine OEM Audi Engine Timing Chain Tensioner, part number 079109507AM. This critical component is responsible for maintaining the correct tension on the engine's timing chain, ensuring precise valve timing and engine synchronization. It is located within the engine's timing system. Weighing 0.211 kg, this tensioner is built to exact specifications for reliable performance. Using a genuine OEM tensioner is vital for preventing premature wear and potential catastrophic engine damage, ensuring long-term engine health.