Genuine OEM Audi Control Chain Tensioner, part number 079109507M. This critical engine component is designed to maintain proper tension on the engine's control chain, ensuring accurate valve timing and smooth engine operation. It is installed within the engine's timing system. Constructed from durable metal with a polymer guide, it weighs approximately 0.19 kg. Choosing a genuine OEM chain tensioner ensures precise fitment, correct tensioning force, and long-term reliability, preventing premature wear and potential engine damage.