Mercedes W203 W204 W210 W211 W220 Radio Remote Alarm Key Fob Button A2037664906

Used key – requires programming

The key requires programming (coding) by a specialist to be fully functional.

Mercedes W203 W204 W210 W211 W220 Radio Remote Alarm Key Fob Button is an original component from the Switches, controls and ignition locks category, designed for operating remote comfort functions in selected Mercedes-Benz models. This is a solution for those who need a factory-specification key fob housing or buttons for further repair, refurbishment, or use as a donor part.

Specifications and technical data

• SKU: A2037664906-2
• Mark: Mercedes (Genuine OE)
• Condition: For parts or not working
• OEM Part Number: A2037664906
• Substitutable numbers: A2037664906, A 203 766 49 06, BG
• Category: Switches & Controls

Application and function in the control system

The presented key fob is a component of the remote control system that works with comfort modules responsible for operating locks, alarms, and radios in selected generations of Mercedes C, E, and S-Class vehicles. As a part from the Switches, controls and ignition locks group, it is responsible for transmitting user signals to the vehicle's electronics via a set of function buttons located in the key housing.

Due to the factory design, the housing and buttons are matched to the characteristic shape of the Mercedes key, which facilitates their use in repairs or the reconstruction of an existing key fob. The product can be useful both in automotive electronics workshops and for users independently assembling components for refurbishment.

Technical characteristics and compatibility

The offered key fob comes from the Mercedes brand, which means it maintains the factory geometry, button layout, and quality standard typical of original components. Thanks to this, it can serve as a base for:

• transferring functional electronic components from another key,
• replacing worn or damaged buttons,
• recreating a complete key fob based on an existing electronic board and blade.

The product is marked as intended for parts or non-functional, which in practice directs it to service or diagnostic applications, or as a donor for the housing and mechanical elements. Before purchasing, it is worth verifying the structural compatibility with your existing key and the requirements of the specific vehicle model.

Service purpose and possible applications

Due to its condition, the key fob will work primarily in the following scenarios:

• refurbishment of an existing key by using the housing or buttons,
• obtaining components for the mechanical repair of the key fob,
• use for training or diagnostic purposes in automotive electronics services.

This type of component is particularly useful where maintaining the original look and ergonomics of the key is important, while there is no need to invest in a complete, fully functional set. Thanks to its factory origin from Mercedes, it is easier to maintain the visual consistency of the vehicle interior and the standard of operation known to the user.

Integration with other Mercedes control elements

In Mercedes vehicles, the remote control system works with comfort modules, the ignition switch, and other elements responsible for safety and user convenience. Replacement or refurbishment of the key fob should always be planned with consideration for programming and matching procedures for the specific car, carried out by a specialized service.

If you are planning a comprehensive repair or modernization of the comfort control zone in your Mercedes and need other elements from the same group, such as function buttons, control modules, or ignition lock housings, check the available parts in the Mercedes switches, controls and ignition locks category.

Expert support and selection of used components

When working with used control components, it is worth paying attention to the origin of the part, structural compatibility, and the cost-effectiveness of refurbishment compared to purchasing new replacements. In the case of the Mercedes brand, often the best solution is to use original parts from disassembly, which allows for maintaining factory quality and compatibility with the vehicle's electronics.

To better understand the advantages of using original second-hand components in cars of this brand, it is worth reading the article Used parts for Mercedes – original parts from disassembly, which discusses the practical aspects of selecting and using such solutions.