Genuine OEM Audi Left Cam Chain Tensioner, part number 078109087F. This essential engine component is responsible for maintaining the correct tension on the camshaft timing chain, which is crucial for precise valve timing and smooth engine operation. It is designed for the left side of the engine. Weighing approximately 1.0 kg, this tensioner features durable metal construction with wear-resistant guide shoes. Choosing a genuine OEM cam chain tensioner ensures factory-specified tension, proper chain alignment, and long-term reliability for your engine's timing system.