Genuine OEM Audi Cam Chain Tensioner, part number 078109088H. This essential engine component is responsible for maintaining the correct tension on the camshaft timing chain, which is crucial for synchronized valve and piston movement. It is installed on the right side of the engine. Constructed from durable machined metal components, it weighs approximately 1.014 kg. Using a genuine OEM cam chain tensioner ensures exact hydraulic or mechanical specifications and reliable operation, preventing costly engine damage due to incorrect timing or chain slack.