BMW 3 E90 Saloon Sliding Sunroof Sun Roof Frame Mechanism Glass

The BMW E90 Sunroof Mechanism is a factory-original part of the tilt-and-slide sunroof system, designed for precise integration with the original body structure of the BMW 3 Series E90. This component, from the Panoramic Roofs, Sunroofs, and Parts group, ensures proper guidance, opening, and closing of the sunroof, restoring full functionality to your car's roof system.

Specifications and technical data

• SKU: 7157447-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7157447
• Substitutable numbers: 54137145920, 7145920, 54107157447, 7157447, 7046166, BG
• Category: Other Exterior Parts & Accessories

Purpose and Function of the Sunroof Mechanism

The sunroof mechanism in the BMW E90 is responsible for the synchronized movement of the sunroof panel within its tracks, controlling its position, and ensuring a secure closure. It is a component structurally matched to the factory roof system, which helps maintain watertightness, proper sealing pressure, and correct interaction with other system components.

Thanks to its original BMW design, the mechanism works with factory mounting points and roof geometry, reducing the risk of stress, jamming, or uneven panel operation. This solution is particularly beneficial for repairs following wear-and-tear damage or seized guides.

Benefits of Using an Original BMW Mechanism

Using a sunroof mechanism specifically designed for the BMW E90 ensures consistency with the vehicle's factory specifications. In practice, this means:

• proper fit with the roof structure and sunroof frame,
• correct interaction with existing accessories and guide elements,
• reduced risk of leaks and improper panel closure,
• easier diagnostics and servicing in the future.

By choosing an original BMW roof mechanism, you minimize the need for modifications and part adjustments, leading to a more predictable repair outcome and stable sunroof operation in the long term.

Characteristics of a Used Part

The offered mechanism is a used part from a dismantled vehicle, allowing for a favorable purchase price while retaining the original BMW construction. A used component is a good solution in situations where the existing mechanism has suffered mechanical damage, seized guides, or deformed tracks, and the priority is to restore proper sunroof operation within a reasonable budget.

Before installation, a standard service procedure is recommended: check the condition of the guides and seals, and ensure correct setting of the end positions according to BMW service documentation. This approach enhances the durability of the entire system and reduces the risk of future malfunctions.

Selection by OEM Number and Interchangeable Numbers

The roof mechanism is a component linked to specific manufacturer designations, which facilitates its identification and selection for a particular BMW E90 model. In practice, this means you can verify compatibility by OEM number and available interchangeable numbers, as well as compare with catalog data or vehicle documentation information.

If you are considering the choice between an original part, an aftermarket replacement, or a used part and want to better understand the differences in cost, quality, and fit based on VIN/OEM numbers, the article will be helpful: Original, Aftermarket, or Used – Which Car Parts Offer the Best Value?

Integration with Other BMW Roof Components

The sunroof mechanism works in conjunction with other system components, such as the glass or metal panel, the roof cassette, seals, and water drainage elements. When performing repairs, it is worth paying attention to:

• the condition and cleanliness of the guides and sliding points,
• the correct routing of cables and drive elements,
• checking operation throughout the full range of opening and tilting after installation.

This approach allows you to fully utilize the potential of the BMW E90 roof mechanism and minimize the risk of repeat service interventions.

If you are planning a comprehensive repair or upgrade of the roof area in your BMW and need other parts from the same group, such as roof cassettes, sunroof panels, or guides, check the available parts in the category BMW Panoramic Roofs, Sunroofs, and Parts.