Mercedes-Benz W203 C 200K M111 Engine Control Unit Module ECU A1111531879

Mercedes-Benz W203 C 200K M111 Engine Control Unit Module ECU is a factory ECU module from the Computers and controllers group, designed for precise management of the powertrain in the C 200 Kompressor model with the M111 engine. It is responsible for monitoring engine operating parameters, communicating with other modules, and handling key functions related to ignition and fuel injection.

Specifications and technical data

• SKU: A1111531879
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1111532979
• Substitutable numbers: A1111531879, A 111 153 18 79, 5WK90403, BG
• Category: Control Modules

Purpose and function of the ECU

This engine control unit has been designed specifically for the powertrain of the Mercedes-Benz C-Class W203 generation in the C 200K version with the M111 engine. As an electronic control unit (ECU), it monitors engine operation in real-time, analyzing signals from sensors and sending appropriate commands to actuators. This ensures stable engine performance, correct response to load, and proper cooperation with other vehicle systems.

Benefits of using an original module

Using an original controller from the Computers and controllers family ensures high compatibility with the factory electrical installation and vehicle software. The module is prepared to work with the factory CAN network, which facilitates diagnostics, adaptation, and potential coding using professional service testers. For workshops and users, this means:

• reliable compatibility with the M111 engine in the C 200K version,
• stable communication with other onboard modules,
• the ability to use factory service and diagnostic procedures.

Product condition and practical application

The offered controller is used, which allows for an economical repair of the engine control system while maintaining factory specifications. This type of module is suitable both as a replacement part after an ECU failure and in cases where electronics need to be matched during an engine swap within the same engine family. Before installation, it is recommended to verify compatibility by part number and prepare for potential programming or immobilizer matching in accordance with service procedures.

Installation and diagnostic recommendations

When replacing the engine control unit, it is worth ensuring a professional approach to installation and configuration. It is recommended to:

• check the electrical installation for damage,
• perform full diagnostics before and after installation,
• apply appropriate coding and adaptation procedures in the vehicle.

This ensures that the new ECU module can operate in stable conditions and the powertrain will maintain proper performance parameters.

Mercedes computers and controllers – expansion and repairs

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 engine controllers, ECU modules, or other electronic control units, check the available parts in the Mercedes computers and controllers category.

More about used automotive electronics

When choosing a used engine controller, it is worth knowing the best practices regarding selection, diagnostics, and installation of such components. Practical tips on how to safely use the secondary market and what to look for when buying an ECU can be found in the article: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?