Mercedes W204 C207 W212 C250 M271.860 204HP Engine ECU Kit A2711500391 Automatic

Mercedes W204 C207 W212 C250 M271.860 204HP Engine ECU Kit Automatic is an engine control unit kit designed for Mercedes C-Class and E-Class vehicles equipped with the M271.860 204HP engine and an automatic transmission. The kit belongs to the Electronic control modules and controllers category, which guarantees factory-fit compatibility with the electrical system and proper integration with the drivetrain. This is a solution for users looking for a proven, used ECU kit for professional repair or replacement.

Specifications and technical data

• SKU: A2711500391-11
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2711500391
• Substitutable numbers: A2711500391, A 271 150 03 91, A0034468840, A 003 446 88 40, 5WK91301, A2079057101, A 207 905 71 01
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and compatibility

The presented ECU kit is intended for Mercedes C-Class and E-Class models with the 204HP M271.860 engine, in W204, C207, and W212 body styles. The kit's design is prepared for operation with an automatic transmission, which is crucial for proper communication between the engine control unit and the transmission control module.

Selecting this type of kit is particularly important when replacing a faulty controller in vehicles with factory turbocharging and advanced engine management electronics. Using a dedicated ECU kit helps minimize adaptation and coding issues compared to generic aftermarket replacements.

ECU kit characteristics

The engine control kit from this series was designed by Mercedes to precisely manage the operating parameters of the M271.860 unit, including fuel injection, ignition, and interaction with safety and comfort systems. Integration with the vehicle's bus enables correct data exchange with other electronic modules, which translates into stable operation of the entire drivetrain.

As an item from the Electronic control modules and controllers category, the ECU kit is prepared to operate in the demanding thermal and electrical conditions typical of the engine bay. The appropriate hardware architecture and control software ensure proper response to sensor signals and compatibility with factory diagnostic systems.

Condition, origin, and benefits of choosing a used ECU

The offered kit is a used component, which provides an attractive cost-effective alternative to new parts while maintaining the manufacturer's original specifications. Choosing an original, used ECU for a Mercedes often allows you to avoid quality and fitment issues that may occur with some aftermarket replacements.

If you want to better understand when it is worth opting for salvaged electronics and how to safely select an engine controller for your car, check out our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. This is a practical addition to your knowledge when planning control system repairs.

Installation and maintenance tips

When installing the ECU kit in Mercedes vehicles with an automatic transmission, it is crucial to follow the manufacturer's procedures, including proper wiring connection, checking grounds and power supply, and performing necessary diagnostic adaptations. It is recommended to have the installation performed by a specialized service center that has the appropriate software and experience working with Mercedes electronics.

To extend the service life of used electronic modules, it is worth ensuring the electrical system is in good condition, checking for proper grounding, and providing protection against moisture and voltage spikes. Additional practical tips on using salvaged parts can be found in the article: How to extend the life of used car parts?, which discusses, among other things, issues related to vehicle electronics.

Expanding the control system in your Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional controllers, auxiliary modules, or engine management systems, check out the available parts in the Mercedes electronic control modules and controllers category.

By choosing original control modules from this brand, you gain software consistency, predictable vehicle behavior, and easier diagnostics in the future. This is especially important in modern designs, where many safety and comfort systems are closely linked to the operation of the engine controller.