Mercedes W209 CLK 320 M112.955 218HP Engine ECU Kit A1121536679 + 2 Keys + Lock

Mercedes W209 CLK 320 M112.955 218HP Engine ECU Kit + 2 Keys + Lock is a practical solution for workshops and users who need a verified engine electronics package for a petrol unit with an automatic transmission. The set includes an electronic control module from the Electronic control modules and controllers group along with matched immobilizer components, which significantly simplifies the repair or replacement process. As a result, you receive a consistent, factory-tuned set, reducing the risk of vehicle starting issues.

Specifications and technical data

• SKU: A1121536679-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1121536679
• Substitutable numbers: A1121536679, A 112 153 66 79, 0 261 208 657, 0261208657, A2095451908, A 209 545 19 08
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented Mercedes W209 CLK 320 M112.955 218HP Engine ECU Kit has been designed to control the operation of a petrol engine working with an automatic transmission. The ECU module is responsible for precise management of fuel injection, ignition, and cooperation with the transmission automation, which translates into stable engine performance and proper operation of onboard systems.

The included keys and lock form a coherent system with the immobilizer, which in practice means reducing the need for programming from scratch and makes it easier to restore full vehicle functionality after the original controller fails. Such a set is particularly useful when replacing a damaged module, dealing with ECU communication problems, or errors preventing the engine from starting.

Benefits of using a complete kit

Using a complete engine controller set with keys and lock in a Mercedes W209 CLK 320 M112.955 218HP brings a number of practical service benefits:

• consistency of engine electronics and immobilizer components,
• reduced risk of software and configuration incompatibility,
• easier starting after installation thanks to matched keys,
• possibility of effective vehicle repair after the original module fails.

For workshops specializing in the Mercedes brand, such a set is a convenient solution that shortens diagnostic and installation time, and for the end user, it means a faster return of the car to full efficiency.

Technical characteristics and compatibility

The electronic control module from this set belongs to the Electronic control modules and controllers group, dedicated to working with a petrol engine and an automatic transmission. Proper hardware and software configuration enables correct cooperation with the electrical installation and the vehicle's communication network, which is crucial for the stable operation of drive systems and safety.

The presence of the OEM part number and interchangeable numbers in the technical specification allows for precise verification of compatibility with a specific version of the M112.955 218HP engine. Before purchasing, it is worth comparing the markings with the vehicle data or seeking professional assistance to ensure that the selected set will be suitable for a given unit.

Product condition and service application

The offered Mercedes W209 CLK 320 M112.955 218HP Engine ECU Kit is a secondary market item, which makes it an attractive cost alternative to new components. This type of solution is often chosen for vehicle repairs where replacing the entire engine electronics set is more cost-effective than regeneration or purchasing individual modules.

The set will work well both in professional services dealing with Mercedes electronics and in specialized independent workshops that are looking for functional, verified components to restore the proper operation of the drive system in the W209 CLK 320 model.

Expert support and selection of used electronics

When selecting a used engine controller and related immobilizer components, it is crucial to properly match them by OEM number, interchangeable numbers, and engine/transmission configuration. A detailed discussion of the selection principles, compatibility verification, and practical aspects of installation can be found in the Global Parts guide: Used automotive electronics – ECU modules and second-hand sensors.

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