Genuine OEM Audi Activated Charcoal Canister, part number 4N0201801C. This essential component of the evaporative emissions system is designed to store fuel vapors from the fuel tank, preventing their release into the atmosphere. It typically sits within the fuel system assembly. Weighing approximately 0.71 kg, the canister contains activated charcoal to absorb these vapors until they can be purged and burned in the engine. Using a genuine OEM activated charcoal canister ensures correct system integration and compliance with emissions regulations.