BMW G20 G21 G42 Bumper Impact Absorber Crash Box Support Front Right O/S 9478578

BMW G20 G21 G42 Bumper Impact Absorber Crash Box Support Front Right O/S is an original body structural component from the Bumpers and reinforcements group, designed for use in the front right section of the vehicle. Engineered by BMW as a precision-fit component, it is responsible for controlled energy absorption during a frontal collision on the passenger side, supporting the vehicle's structural safety.

Specifications and technical data

• SKU: 9478578
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9478578
• Substitutable numbers: 51119478578, 9478578
• Location on the vehicle: Front, Right
• Category: Bumpers & Reinforcements

Purpose and technical function

The front right bumper impact absorber is a component that operates in the first line of load during a frontal impact. Its tasks include:

• controlled deformation in a specific sequence,
• transferring and dissipating collision energy to other structural elements,
• working in conjunction with the bumper beam and other body reinforcements,
• maintaining the correct mounting geometry of the front bumper on the right side.

Thanks to its factory geometry and appropriately selected deformation characteristics, this component helps maintain predictable body behavior in a collision situation and facilitates the correct reconstruction of the vehicle's front end after body repairs.

Compatibility with BMW G20, G21 and G42

The presented impact absorber has been constructed specifically for the latest generation BMW 3 Series and 2 Series platform, with the vehicle placement defined as front – right side. This means that:

• compatibility with factory mounting points in the body is maintained,
• there is no need to modify the load-bearing structure in the front end area,
• it is easier to restore the bumper line and component fitment after repairs.

Such fitment is particularly important in modern BMWs, where assembly precision affects not only aesthetics but also the operation of safety systems and the aerodynamics of the vehicle's front end.

Component characteristics and advantages

The front right bumper impact absorber, as a body structural element, plays a key role in the vehicle's structural protection. Using an original component from the BMW OE group ensures:

• consistency with the vehicle's factory passive safety concept,
• appropriate rigidity and predictable deformation under load,
• compatibility with other reinforcements and bumper mounts.

The product is offered in used condition, which allows for an economical repair of the vehicle's front end while maintaining the original construction. For body shops and service centers specializing in the BMW brand, this is a practical solution for post-collision reconstruction, especially when maintaining factory geometry is essential.

Professional use in post-accident repairs

Replacing the bumper impact absorber is a standard procedure in post-accident repairs when the vehicle's front end has been deformed on the passenger side. Using the correct component for the front – right side allows you to:

• restore the correct position of the bumper and reinforcements,
• maintain the line of the fenders, hood, and headlights,
• minimize the need for additional structural modifications.

As a result, the repair process is more predictable, and the final effect is closer to the manufacturer's factory specifications, which is important for both safety and the vehicle's value on the secondary market.

If you are planning a comprehensive repair or upgrade of the front bumper zone in your BMW and need other elements from the same group, such as reinforcements, beams, or additional brackets, check out the available parts in the BMW Bumpers and reinforcements category.

For users interested in a broader context of operation and repair of cars of this brand, including the costs of body structural elements compared to mechanical components, an article comparing popular BMW diesel units may be helpful – details can be found in the material BMW N47 vs M57 / M57N / M57N2 – ranking of legendary diesels.