Genuine OEM Audi Fuel Tank Cap, part number 8P0201550C. This essential component securely seals the fuel tank opening, preventing the escape of fuel vapors and protecting the fuel system from external contaminants. It also plays a role in maintaining the correct pressure within the fuel tank. The cap is typically made of durable plastic and includes a tether to prevent loss. Weighing approximately 0.075 kg, it is designed for a precise fit. Choosing a genuine OEM fuel tank cap ensures a perfect seal, proper pressure regulation, and compatibility with the vehicle's evaporative emissions system, preventing 'check engine' lights related to fuel system leaks.