Mercedes W204 C250 BlueEFFICIENCY M271.860 204HP Engine ECU Kit A2711500391 Key

Engine Control Unit (ECU) with Key for Mercedes W204 C250 BlueEFFICIENCY M271.860 204HP is an advanced set from the Electronic Control Modules and Units category, designed for vehicles with a gasoline engine and automatic transmission. This is a practical solution for workshops and users who need a tested, used electronic set to restore full functionality to the powertrain.

Specifications and technical data

• SKU: A2711500391-3
• 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, A2079052600, A 207 905 26 00
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

ECU Set Purpose and Function

The offered engine control unit set is dedicated to the Mercedes C-Class W204 generation, specifically the C250 BlueEFFICIENCY version with the M271.860 engine producing 204 HP. The set is responsible for precise control of the gasoline engine's operation, cooperation with the automatic transmission, and integration with the vehicle's other electronic systems. By maintaining component consistency within a single set, it simplifies the adaptation process in the car and reduces the risk of communication problems between modules.

Benefits of Using a Complete Set

Using a complete ECU set with a key can, in many cases, avoid time-consuming programming from scratch and complex procedures for matching individual components. For workshops specializing in Mercedes electronics, this means:

• component consistency within a single engine control system,
• an increased chance of quickly starting the vehicle after repair,
• reduced costs associated with purchasing individual modules,
• the possibility of effective diagnostics and testing based on original manufacturer solutions.

For the end-user, this translates into a more predictable repair process and a greater chance of stable powertrain operation after replacing electronic components.

Technical Characteristics and Compatibility

The ECU set is designed to work with a gasoline engine and an automatic transmission, which is crucial when selecting parts for Mercedes C-Class vehicles. The set comes from the original Mercedes product line and is compatible with the electronic architecture used in the W204 C250 BlueEFFICIENCY models. The inclusion of a key in the set simplifies integration with the immobilizer system and allows for a more predictable configuration process in the vehicle.

Condition, Origin, and Practical Application

The offered set is a used part, sourced from dismantling, which provides an attractive cost alternative to new components. Such solutions are often chosen by professional service centers that combine rational repair costs with the preservation of the vehicle's original electronic architecture. A properly selected ECU set for the Mercedes W204 C250 can effectively resolve issues related to engine control unit damage, communication errors, or the inability to start the car.

Substantive Support and Development of Automotive Electronics Knowledge

When working with advanced electronics in premium vehicles, it is worthwhile to expand knowledge on diagnostics and the use of salvaged parts. We encourage you to read our guide on our blog: how to care for electronic modules and engine control units using used parts, which discusses practical aspects of working with control systems in modern cars.