Genuine OEM Audi Activated Charcoal Canister, part number 4M0201799S. This vital component is part of the evaporative emissions control system, designed to capture and store fuel vapors from the fuel tank, preventing their release into the atmosphere. It is typically located within the fuel system assembly. Weighing 0.356 kg, this canister contains activated carbon media to absorb hydrocarbon vapors. Using a genuine OEM activated charcoal canister ensures proper vapor absorption capacity, correct system integration, and compliance with stringent emissions regulations, maintaining environmental performance and preventing fault codes.