Genuine OEM Audi Engine Vacuum Hose, part number 03L131552AS. This hose is a vital part of the engine's vacuum system, responsible for transmitting vacuum pressure to various engine components, which is crucial for functions like brake boosting, emissions control, and turbocharger regulation. The hose is approximately 0.41 meters long. Opting for a genuine OEM vacuum hose ensures the correct material flexibility, resistance to engine bay temperatures, and precise routing, preventing vacuum leaks that can impair engine performance and fuel efficiency.