BMW E87 E90 E91 118i 318i N46 129HP ECU Unit KIT DME CAS2 Key 7561834 Automatic

BMW E87 E90 E91 118i 318i N46 ECU Unit KIT DME CAS2 Key Automatic is a complete electronic set designed for petrol engine control systems in BMW 1 and 3 series models with an automatic transmission. The kit includes the DME controller, CAS2 module, and a matched key, facilitating professional replacement and restoration of proper drivetrain operation. It is a practical solution for workshops and users who need a coherent set of control components.

Specifications and technical data

• SKU: 7561834-15
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7561834
• Substitutable numbers: 12147561834, 7561834, 12147565300, 7565300, 12147565301, 7565301, 12147557290, 7557290, 12147557930, 7557930, 0261201159, 61356981416, 6981416
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS2 Key kit

The presented kit belongs to the Electronic control modules and controllers group and is dedicated to BMW vehicles with an N46 petrol engine and an automatic transmission. The DME controller is responsible for precise management of the engine's operation, while the CAS2 module works with the key, handling start authorization and communication with other vehicle systems. As a result, the set ensures consistent operation of the ignition, injection, and vehicle security systems.

Combining the engine controller with the CAS2 module and key in one set minimizes the risk of electronics matching issues, which is particularly important when replacing components in modern BMW installations. This solution allows for the efficient restoration of vehicle functionality following a failure of the original controller or damage to the immobilizer system.

Benefits of using an original BMW module

The offered set comes from the BMW line, which means maintaining the factory connection architecture, correct communication bus topology, and compatibility with the software used in these models. In practice, this translates into:

• proper cooperation with the vehicle's electrical system,
• maintenance of diagnostic functions via the OBD port,
• stable communication with other controllers in the vehicle network.

For workshops specializing in the BMW brand, such a set is a convenient, technically coherent solution that reduces the time required for programming and matching individual components. The completeness of the ECU kit with CAS2 and key also facilitates the adaptation process to a specific vehicle according to service procedures.

Operating characteristics with petrol engine and automatic transmission

The kit has been designed to work with a petrol engine and an automatic transmission, which is important when selecting the appropriate controller for a specific vehicle configuration. The DME controller handles strategies related to fuel dosing, ignition, and communication with the automatic transmission control module, ensuring smooth gear changes and correct response to engine load.

Thanks to this, the kit is particularly useful in situations where it is necessary to replace electronics in BMW 1 and 3 series vehicles with an N46 unit, while simultaneously requiring the maintenance of proper cooperation with the automatic transmission without additional installation modifications.

Condition, verification, and practical application

The product is offered as a used original component, which in practice means a beneficial combination of OEM quality and an attractive price compared to new parts. This type of electronics is frequently chosen by professional service centers looking for solutions that allow for an economical yet technically correct repair of premium class vehicles.

To better understand the principles of selecting and installing such components, it is worth reading the guide describing selection by OEM numbers, hardware and software compatibility, and typical service questions – this is discussed in detail in the article Used car electronics on board – why is it worth choosing second-hand ECU modules and sensors?. There, you will find practical tips regarding working with used controllers and security modules.

Expanding the control system in BMW – related modules

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

For a broader perspective on the cost-effectiveness of using used original components in premium cars, you can also take advantage of the market trend analysis described in the article Crisis in the new parts market? Why used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend in 2026, which shows how to consciously plan repairs using second-hand OEM electronics.