Genuine OEM Audi Vacuum Hose, part number 03L131055DJ. This hose is responsible for transmitting vacuum pressure to various engine and emissions control systems, enabling their correct function. It is typically constructed from durable, flexible rubber or plastic compounds designed to maintain integrity under vacuum. Using a genuine OEM vacuum hose ensures precise routing, proper sealing, and resistance to collapse or cracking, which are vital for maintaining engine performance and efficiency.