Air Duct, Lower

The genuine BMW Lower Air Duct (51745A35E19) is compatible with the BMW 1 Series F70 (from 03/2023), BMW 2 Series F74 Gran Coupé (from 06/2023) and BMW 2 Series F78 Gran Coupé (from 08/2023).

This genuine OEM BMW part (51745A35E19) is the original lower air duct used within the front cooling and air duct 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. This genuine OEM BMW lower air duct is designed for specific factory equipment configurations as defined by BMW.

The lower air duct is designed to channel airflow efficiently through the front of the vehicle, helping to optimise cooling performance and supporting the correct operation of surrounding engine cooling components. BMW specifies that this component is fitted to vehicles with particular factory equipment combinations, including variations relating to Emergency Vehicle Preparation, CO₂ equipment, J-LEV RDE exhaust emission standard and Cold Climate specification, depending on the vehicle’s original build.

As a genuine OEM BMW part, this lower air duct is manufactured to BMW’s original specifications, ensuring precise fitment, excellent durability and dependable 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 51745A35E19 is the correct lower air duct for the compatible BMW models listed above. Choosing a genuine OEM BMW replacement part helps maintain factory-correct fitment, efficient airflow management and the long-term reliability expected from original BMW components.

Part 51745A35E19 is identified as number 03 in the diagram.

For vehicles:

• with Preparation, emergency vehicle S138A=Yes
• with CO2 equipment S1CBA=Yes
• with Exhaust emission standard J-LEV RDE S1DLA=No
• with Cold-climate version S842A=No