Mercedes W204 W212 W221 Radio Remote Control Keyless Key Button A2049050804

Used key – requires programming

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

Mercedes W204 W212 W221 Key Fob Fish A2049050804 is an original part from the Switches, Control Elements and Ignition Switches group, designed for Mercedes vehicles. It is suitable as a base for repair, refurbishment, or sourcing specific electronic components and housing in specialized automotive electronics services.

Specifications and technical data

• SKU: A2049050804-1
• Mark: Mercedes (Genuine OE)
• Condition: For parts or not working
• OEM Part Number: A2049050804
• Substitutable numbers: A2049050804, A 204 905 08 04
• Category: Switches & Controls

Application and Function in the Vehicle

The presented "fish" type key fob belongs to the group of elements responsible for central locking control, ignition activation, and comfort function operation in selected Mercedes C, E, and S-Class models. As a part from the Switches, Control Elements and Ignition Switches category, it cooperates with the immobilizer system, comfort modules, and the electronic ignition switch, forming an essential part of the vehicle's security system.

Due to its intended purpose, the key fob can be used as a donor for components to repair an existing remote, for workshop testing, or as training material when working with Mercedes electronics.

Technical Characteristics and Construction

The Mercedes "fish" key fob combines remote control functions and elements cooperating with the electronic ignition switch within a single housing. Inside, there are electronic circuits responsible for:

• communication with the vehicle in the remote control system,
• cooperation with the immobilizer and body modules,
• operation of the mechanical buttons on the key fob housing.

The housing is contoured to the characteristic "fish" shape, ensuring a comfortable grip and easy tactile identification. The button layout is typical for Mercedes key fobs, facilitating intuitive operation of locking, unlocking, and additional comfort functions, if provided for in the specific vehicle.

Product Condition and Possible Service Applications

The item is offered in the condition for parts or not working, meaning it is not intended for direct, immediately functional use as a complete, fully operational key fob. However, it can be a valuable source of parts for specialized services dealing with:

• refurbishment of Mercedes remote key fobs,
• transferring electronics or housings,
• diagnostics and testing of control systems,
• training on key fob programming and repair.

For workshops and automotive electronics technicians, such an item is useful as material for experiments, structural comparisons, and for obtaining specific components that can be used in the repair process of other key fobs.

Part Selection by Make and Category

If you are planning a comprehensive repair or upgrade of the control and security zone in your Mercedes and need other elements from the same group, such as electronic ignition switches, button modules, or comfort function switches, check the available parts in the category Mercedes Switches, Control Elements and Ignition Switches.

Support for Selecting Used Mercedes Parts

When working with key fobs, comfort modules, and other control elements in a Mercedes, it is crucial to use original components, even if they are from disassembly. This ensures compatibility with the vehicle's electronics and proper cooperation with safety systems. You can find more about the advantages of using original used components in the article Used Mercedes Parts – Original Parts from Disassembly.

If you want to further deepen your knowledge on verifying component compatibility by OEM numbers and avoid mistakes when shopping online, the guide Shopping for Parts by OEM Numbers and Their Safe Verification will be helpful, which also describes procedures for Mercedes models.