Air Duct with Air Flap Control, Lower

The genuine BMW Lower Air Duct with Air Flap Control (51745A6A9A3) is compatible with the BMW 1 Series F70 (03/2023–03/2025) and BMW 2 Series F74 Gran Coupé (06/2023–03/2025).

This genuine OEM BMW part (51745A6A9A3) is the original lower air duct with integrated air flap control used within the front cooling and airflow management system on the compatible BMW models listed above. Official BMW parts information confirms that this part has been in production from 01/07/2024 and is intended for vehicles specified without BKS (OHNE BKS).

The lower air duct directs cooling air efficiently through the radiator and engine cooling system, while the integrated active air flap helps regulate airflow according to driving conditions. This improves engine temperature management, aerodynamic efficiency and overall vehicle performance. The OHNE BKS designation indicates that this version is intended for vehicles without the BKS equipment specification, making it important to confirm compatibility before ordering.

As a genuine OEM BMW part, this component is manufactured to BMW’s exact specifications, ensuring precise fitment, excellent durability and dependable long-term performance. It is a direct replacement for the factory-fitted component and installs without modification on compatible vehicles.

According to the official BMW parts catalogue, 51745A6A9A3 is the correct lower air duct with air flap control for the BMW models listed above when equipped with the applicable factory specification. Choosing a genuine OEM BMW replacement helps maintain the original cooling efficiency, aerodynamic performance and reliability intended by BMW.

Part 51745A6A9A3 is identified as number 05 in the diagram.

For vehicles:

• with Preparation, emergency vehicle S138A=No
• with CO2 equipment S1CBA=Yes
• with Extra package, EU-speciifc S230A=Yes