Genuine OEM Audi Radiator Grille Shutter Assembly, part number 4M0121219B. This assembly actively controls the amount of airflow reaching the radiator, optimizing engine temperature and improving aerodynamic efficiency. It is positioned at the front of the vehicle, typically behind the main grille. Constructed from durable black plastic, it weighs 2.681 kg and measures approximately 0.95m in length. A genuine OEM shutter assembly ensures precise operation of the louvres, proper integration with vehicle electronics, and reliable temperature regulation for engine longevity and fuel efficiency.