Genuine OEM Audi Engine Vacuum Hose, part number 4K0131051B. This hose assembly is an integral part of the engine's vacuum system, responsible for conveying vacuum pressure to various engine components and actuators. Proper vacuum supply is critical for functions such as brake boosting, emissions control, and turbocharger regulation. The assembly weighs approximately 0.12 kg and measures 49 cm in length. Choosing a genuine OEM vacuum hose ensures the correct routing, material integrity, and leak-free connections, which are essential for maintaining optimal engine performance and efficiency.