Mercedes W221 Roof Ultrasonic Burglar Alarm Sensor Cover Trim Black A2218200149

Mercedes W221 Roof Ultrasonic Burglar Alarm Sensor Cover Trim is a precision trim component from the Headliner and parts category, designed for installation around the alarm sensor in the vehicle's roof. The black color ensures consistency with the factory interior finish, and the design tailored to the W221 model allows for an aesthetic and functional mounting of the sensor in the headliner.

Specifications and technical data

• SKU: A2218200149
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2218200149
• Substitutable numbers: A2218200149, A 221 820 01 49
• Color: Black
• Category: Headliners & Parts

Purpose and function of the component

The Mercedes W221 Roof Ultrasonic Burglar Alarm Sensor Cover Trim is responsible for the stable and aesthetic mounting of the motion detection module inside the cabin. This component:

• masks the mounting hole in the headliner,
• ensures proper positioning of the sensor relative to the vehicle interior,
• protects the alarm module against accidental mechanical damage,
• maintains a consistent appearance of the headliner in the roof area.

Thanks to its fit to the interior geometry of the W221 model, the cover supports the proper operation of the alarm system without restricting the field of operation of the ultrasonic sensor.

Construction, color, and interior fit

The component is made in black, which facilitates integration with typical interior configurations in the Mercedes S-Class W221 generation. The neutral color allows for use in vehicles with both dark headliners and mixed configurations, maintaining a consistent, orderly look of the roof zone.

The design of the cover has been engineered for the specific layout of the headliner in the W221, which translates into a proper fit with the surrounding upholstery elements. Properly shaped edges and mounting points reduce the risk of looseness, squeaking, or the component protruding after installation.

Characteristics of the used component

The product is used, which in practice means it may show signs of wear typical for interior components, yet it retains its functionality in terms of mounting and covering the sensor. This solution allows for an economical replacement of a damaged or missing cover while maintaining the original mounting specification.

Choosing an original component from disassembly reduces the risk of fitment issues, often encountered with aftermarket parts of universal geometry. As a result, the installation process is smoother, and the visual effect remains close to the factory standard.

Benefits of using the original cover

Using this cover in a Mercedes W221 brings a number of practical benefits:

• Factory fit – a component designed for a specific body model, with no need for headliner modifications.
• Consistent interior aesthetics – black color and appropriate shape allow for restoring the orderly look of the roof zone.
• Alarm sensor protection – stable mounting and protection against accidental mechanical contact.
• Support for proper alarm system operation – correct positioning of the sensor in the cabin space.

Expansion and completion of headliner elements

If you are planning a comprehensive repair or upgrade of the roof zone in your Mercedes and need other elements from the same group, such as covers, grilles, or additional headliner panels, check the available parts in the Mercedes Headliner and parts category.

Technical support and additional knowledge

When working with safety and comfort systems inside the vehicle, it is worth using reliable sources of knowledge. If you are simultaneously upgrading the vehicle's lighting or replacing elements related to headlights, the following guide may be useful: See more and better – a complete guide to selecting and replacing used LED and Xenon headlights. It allows you to better plan the scope of work on the car, combining the replacement of interior elements with the optimization of exterior lighting.