Genuine OEM Audi Engine Intake System Vent Hose, part number 8K0201991BQ. This hose ventilates the engine intake system, managing air and vapor flow to ensure proper engine operation and emissions control. It is a component within the complex network of hoses connected to the intake manifold, as indicated by item 25 in the diagram. Weighing 0.1 kg, this hose is designed for specific routing and material resistance. Choosing a genuine OEM hose ensures correct material composition, flexibility, and resistance to engine bay conditions, preventing leaks and system malfunctions.