Genuine OEM Audi Air Filter Element, part number 4K0133844D. This filter is crucial for preventing dust, pollen, and other airborne particles from entering the engine's intake system, ensuring clean combustion. It is typically housed within the air filter box in the engine bay. Weighing 1.05 kg, this cylindrical filter provides efficient air purification. A genuine OEM air filter ensures optimal filtration efficiency, proper airflow, and a perfect seal, which are vital for engine longevity and performance.