Genuine OEM Audi Active Charcoal Container, part number 1K0201797B. This evaporative emissions (EVAP) system component is designed to absorb harmful fuel vapors from the fuel tank, storing them until they can be safely purged into the engine for combustion. It is typically located within the vehicle's underbody or engine bay, connected to the fuel system. Constructed from durable plastic with internal activated charcoal, it weighs approximately 2.16 kg. Using a genuine OEM charcoal container ensures proper vapor absorption capacity and system integrity, crucial for emissions compliance and preventing fuel system issues.