Genuine OEM Audi Active Charcoal Filter with Pump, part number 3C0201797D. This component is crucial for the vehicle's evaporative emissions control system, capturing fuel vapors from the fuel tank and preventing them from escaping into the atmosphere. It typically sits within the fuel system assembly. Weighing approximately 2.71 kg, it is a substantial component of the emissions system. Opting for a genuine OEM active charcoal filter ensures correct vapor absorption capacity and proper integration with the vehicle's diagnostic systems, preventing 'Check Engine' lights and ensuring compliance.