Mercedes W205 C200 274.920 184HP Engine Control Unit ECU A2749000800

Mercedes W205 C200 274.920 184HP Engine Control Unit A2749000800 is a factory original electronic control module designed for the powertrain unit in the W205 C200 model. This item from the Electronic Control Units and Controllers group is responsible for precise engine operation management, ensuring stable parameters and proper cooperation with other vehicle systems.

Specifications and technical data

• SKU: A2749000800-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2749000800
• Substitutable numbers: A2749000800, A 274 900 08 00, A2749010600, A 274 901 06 00, 0261S08785, 0 261 S08 785
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and Function of the Engine Controller

The presented control unit is dedicated to the gasoline engine designated 274.920 with 184 HP in the Mercedes C-Class W205 generation. As the central ECU, it manages, among other things, fuel delivery, ignition, auxiliary equipment operation, and communication with other modules in the vehicle, which translates into a consistent and predictable engine performance characteristic.

The controller has been designed to work with an automatic transmission, ensuring proper data exchange between the powertrain and the gearbox. This is crucial for smooth gear changes, correct gear selection, and maintaining driving comfort in various vehicle operating modes.

Benefits of Using an Original ECU Module

Using an original controller in the Mercedes W205 C200 allows for the preservation of factory engine control strategies, which facilitates vehicle diagnostics and servicing in the future. Consistency with Mercedes' electronic architecture reduces the risk of CAN bus communication errors and software compatibility issues.

The module belongs to the Electronic Control Units and Controllers group, meaning it is designed to operate in the demanding engine bay environment, considering vibrations, temperature changes, and humidity. A properly selected controller ensures not only correct engine unit operation but also stable performance of safety and comfort systems that rely on engine data.

Professional Selection and Installation

Before purchasing, it is recommended to verify the module's compatibility with the specific vehicle configuration, particularly regarding the engine version, transmission type, and software. In workshop practice, it is standard to select by OEM number and interchange numbers, followed by software adaptation (coding, adaptation, potential immobilizer registration) according to the manufacturer's procedures.

To maximize the potential of this controller, it is advisable to entrust the installation and configuration to a specialized service center equipped with the appropriate diagnostic software. Correct ECU installation and programming minimize the risk of errors, dashboard warning lights, and problems with starting or engine operation under load.

Used Engine Controller – An Informed Choice

The offered control unit is a used item, which significantly reduces repair costs compared to purchasing a new module, while maintaining the original manufacturer's specifications. This solution is particularly attractive for more serious engine electronics failures where replacing the entire ECU is economically justified.

For users who wish to deepen their knowledge on selecting and installing such components, we have prepared a practical guide describing, among other things, selection by VIN and OEM numbers, hardware and software compatibility issues, and common service questions – you can find it in the article Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?.

Expanding the Control System in a Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other parts from the same group, such as additional ECUs, auxiliary controllers, or electronic units managing auxiliary equipment, check the available parts in the Mercedes Electronic Control Units and Controllers category.

Mercedes W205 C200 274.920 184HP Engine Control Unit A2749000800 is a solution for drivers and workshops that expect compatibility with the vehicle's factory architecture, predictable engine unit behavior, and the possibility of economical engine control system repair while adhering to manufacturer standards.