Mercedes C W204 ECU Key Ignition Switch Lock 2.1 Diesel 122HP A6461509577

Mercedes C W204 ECU Key Ignition Switch Lock 2.1 Diesel 122HP is a set from the Electronic control modules and ECUs group, designed for the starting system and management of the diesel unit. The set ensures consistent operation of the electronics responsible for key authorization, ignition switch operation, and cooperation with the diesel engine control system.

Specifications and technical data

• SKU: A6461509577
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461509577
• Substitutable numbers: A6461509577, A 646 150 95 77, 0281014659, 0 281 014 659, A 209 545 39 08, A2095453908, A 203 766 50 06, A2037665006
• Fuel type: Diesel
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Purpose and function in the vehicle system

The offered component is dedicated to Mercedes C W204 series vehicles, equipped with a 2.1-liter diesel engine with 122 HP. It is part of an advanced electronic system responsible for key recognition, ignition switch operation, and transmitting signals to the engine control unit, which enables proper starting and stable operation of the power unit. By using an original module from this group, the starting system maintains factory operating logic, and communication between individual electronic components remains consistent with the vehicle manufacturer's requirements.

Technical characteristics and compatibility

The product belongs to the Electronic control modules and ECUs category, which means it works directly with the vehicle's electrical installation and communication buses. It has been designed to work with a Diesel-powered engine, which is significant for starting maps, security strategies, and the method of communication with other modules in the car. The element has an assigned OEM part number and associated interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration. Before purchasing, it is worth comparing the markings with the currently installed module or service documentation to ensure full compatibility with the given equipment version.

Condition, origin, and service application

The offered module is a used component, sourced from dismantling, which allows for cost-effective repair of the starting system while maintaining the manufacturer's original specifications. This type of solution is particularly beneficial for older Mercedes C W204 models, where the cost of new electronics can be disproportionately high relative to the vehicle's value. In practice, the module can be used both as a replacement for a damaged controller or key-ignition switch assembly, and as an auxiliary element for diagnosing problems with starting, key authorization, or communication in the vehicle network. A properly selected component allows for restoring correct system operation without interfering with the engine mechanics.

Benefits of using an original module

Using an original element from the group of controllers and starting modules in a Mercedes C W204 ensures:

• preservation of factory security and key authorization logic,
• proper cooperation with the electrical installation and other comfort and engine modules,
• consistency of operating parameters with the 2.1 Diesel 122 HP unit,
• possibility of integration with the existing vehicle configuration without the need for costly modifications. For workshops specializing in the Mercedes brand, such a module is a practical service solution, allowing for reduced repair time and limiting the risk of communication problems in the vehicle network.

Used electronics – how to approach the purchase

When choosing a used controller or key-ignition switch assembly, it is worth paying attention to the compatibility of markings, fuel type, and vehicle generation. Additionally, it is important to entrust the installation and any necessary programming to a service center with experience in Mercedes electronics, which minimizes the risk of adaptation errors. If you want to better understand when purchasing a used control module makes sense, how to assess its suitability, and what to pay attention to during installation, check out the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Related Mercedes Electronic control modules and ECUs

If you are planning a comprehensive repair or upgrade of the control electronics area in your Mercedes and need other elements from the same group, such as engine modules, comfort controllers, or safety system management units, check the available parts in the Mercedes Electronic control modules and ECUs category.