Air Flaps, Lower

The genuine BMW Lower Air Flaps (51745B4C881) are compatible with the BMW 1 Series F70 (03/2023–03/2025), BMW 2 Series F74 Gran Coupé (05/2023–03/2025) and BMW 2 Series F78 Gran Coupé (08/2023–03/2025).

This genuine OEM BMW part (51745B4C881) is the original lower air flap assembly used within the vehicle’s active front cooling and airflow management system. According to the official BMW parts catalogue, this component has been fitted from 01/07/2024 and is designed specifically for the compatible BMW models listed above.

The lower air flaps regulate the amount of air entering the cooling system by opening and closing automatically according to engine temperature and driving conditions. This helps improve engine warm-up times, maintain optimum cooling efficiency and reduce aerodynamic drag, contributing to improved fuel efficiency and overall vehicle performance.

As a genuine OEM BMW part, this component is manufactured to BMW’s original specifications, ensuring precise fitment, long-lasting durability and reliable operation. It is a direct replacement for the original factory-installed air flap assembly and fits compatible vehicles without modification.

Official BMW parts information confirms that 51745B4C881 is the correct lower air flap assembly for the compatible BMW models listed above. Choosing a genuine BMW replacement helps preserve the vehicle’s original cooling performance, aerodynamic efficiency and factory-standard reliability.

Part 51745B4C881 is identified as number 06 in the diagram.