BMW X1 U11 iX I20 Underbody Underfloor Blind Plug Set x5 9478157

Visual condition of the part

The product shows signs of use visible in the photos.

BMW X1 U11 iX I20 Underbody Underfloor Blind Plug Set is an original set of protective components designed for the factory shielding system in BMW X1 U11 and BMW iX I20 models. The set has been designed as part of the Mud Flaps group to effectively limit the ingress of dirt and moisture into critical points of the underbody. It is a practical solution for users who want to maintain the structural integrity of the bodywork and keep the vehicle in good operating condition.

Specifications and technical data

• SKU: 9478157
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9478157
• Substitutable numbers: 9478157, 51719478157
• Part type: Splash Guard
• Category: Splash Guards & Mud Flaps

Purpose and function of the set

The presented underbody blind plug set is dedicated to specific generations of the BMW X1 U11 and BMW iX I20, which ensures a proper fit to the factory mounting points. These components work in conjunction with the wheel arch and mud flap system, limiting direct contact of the underbody with water, mud, and small stones.

The plugs perform several key operational functions:

• sealing selected technological holes in the underbody zone,
• supporting the operation of mud flaps by reducing water and dirt splashes,
• protecting against accelerated wear of components located near the wheels.

Construction and fitment for BMW

The set consists of five compatible plugs, prepared for installation in the factory-designated locations. The design was developed by BMW with the aim of maintaining the appropriate airflow geometry under the vehicle and proper water drainage from the wheel arch area.

Proper fitment to the specific vehicle platform reduces the risk of looseness, unwanted vibrations, and leaks. Thanks to this, the set can be used both for replacing individual damaged components and for more comprehensive maintenance of the wheel arch and underbody zone.

Operational characteristics and installation

The product comes from the Mud Flaps group, which is why its construction is designed to withstand difficult road conditions – in contact with water, salt, and contaminants. The applied mounting solutions allow for service without interfering with the load-bearing structure of the body, which facilitates maintenance in workshop conditions.

In practice, the underbody blind plug set can be used, among other things, for:

• repairs after mechanical damage in the wheel arch area,
• replacing missing components after previous disassembly,
• preparing the vehicle for intensive use in more difficult road conditions.

Condition and benefits of use

The offered set is a secondary market item, which allows for the economical restoration of the factory functionality of the underbody shielding system. Properly selected plugs help limit the accumulation of dirt in hard-to-reach places, which promotes easier service and can positively influence the long-term operation of the vehicle.

The use of original BMW design solutions ensures consistency with other body components and also facilitates part identification based on OEM markings and interchangeable numbers available in the technical specification.

Expanding the BMW underbody protection system

If you are planning a comprehensive repair or upgrade of the wheel arch and underbody zone in your BMW and need other components from the same group, such as additional shields, supplementary plugs, or further splash protection modules, check the available parts in the BMW Mud Flaps category.

If you are preparing your car for the winter season and want to take a conscious approach to selecting used protective components, it is worth reading the practical tips contained in the article Winter essentials: which used car parts are worth checking and replacing before the frost?, where you will find checklists and information on working with OEM numbers.