Air duct, Upper

The genuine BMW Upper Air Duct (51745A35E17) is compatible with the BMW 1 Series F70 (from 03/2023), BMW 2 Series F74 Gran Coupé (from 05/2023) and BMW 2 Series F78 Gran Coupé (from 08/2023).

This genuine OEM BMW part (51745A35E17) is the original upper air duct fitted within the front air duct and cooling assembly on the compatible BMW models listed above. According to the official BMW parts catalogue, this component has been in use from 01/07/2024 and remains a current part with no replacement listed. It is designed to direct airflow efficiently through the front cooling system, helping to optimise engine cooling performance while protecting surrounding components.

BMW also specifies that this upper air duct is intended for vehicles that meet particular factory equipment combinations, including variations relating to emergency vehicle preparation, CO₂ equipment, exhaust emission standard J-LEV RDE and cold-climate specification, depending on the vehicle configuration. Compatibility is therefore determined by the vehicle’s original factory specification.

As a genuine OEM BMW part, this upper air duct is produced to BMW’s original specifications, ensuring precise fitment, excellent durability and reliable long-term performance. It installs directly in place of the original component without modification, making it the ideal replacement for a damaged or worn air duct.

Official BMW parts information confirms that 51745A35E17 is the correct upper air duct for the compatible BMW models listed above. Choosing a genuine OEM BMW replacement part helps maintain factory-correct fitment, dependable cooling performance and the long-term reliability expected from original BMW components.

Part 51745A35E17 is identified as number 02 in the diagram.

For vehicles:

• with Preparation, emergency vehicle S138A=Yes
• with CO2 equipment S1CBA=No