Air Duct with Air Flap Control, Lower

The genuine BMW Lower Air Duct with Air Flap Control (51745A571A6) 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 (51745A571A6) is the original lower air duct with integrated air flap control fitted to the front cooling and airflow management system of the compatible BMW models listed above. According to the official BMW parts catalogue, this part has been in use from 01/07/2024 and is specified for vehicles equipped with BKS.

The lower air duct and active air flap assembly are designed to regulate airflow through the front cooling system, helping the engine reach and maintain its optimum operating temperature while improving aerodynamic efficiency. By opening and closing the integrated air flap when required, the system assists with cooling performance, fuel efficiency and overall vehicle operation.

As a genuine OEM BMW part, this component is manufactured to BMW’s original specifications, ensuring precise fitment, long-lasting durability and dependable performance. It is a direct replacement for the original factory-installed component and requires no modifications when fitted to the correct vehicle.

Official BMW parts information confirms that 51745A571A6 is the correct lower air duct with air flap control for the compatible BMW models listed above. Choosing a genuine OEM BMW replacement helps preserve the vehicle’s original cooling performance, aerodynamic efficiency and factory-standard reliability.

Part 51745A571A6 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=No