Genuine OEM Audi Leak Detection Pump Filter, part number 1C0906621A. This component is vital for the Evaporative Emission Control (EVAP) system, specifically filtering the air that enters the leak detection pump. Its function is to prevent contaminants from interfering with the pump's ability to accurately test the fuel system for leaks, ensuring proper emissions control. The filter is a compact unit, weighing 0.1 kg, with dimensions of 0.112m length, 0.088m width, and 0.065m height. Using a genuine OEM filter guarantees the correct filtration efficiency and durability, preventing premature failure of the leak detection pump and maintaining the vehicle's emissions compliance.