BMW E87 E90 120i 320i N46 150HP Engine ECU KIT DME CAS2 + Key 7557290 Manual

BMW E87 E90 120i 320i N46 150HP Engine ECU KIT DME CAS2 + Key Manual is a complete engine control set designed for 150 HP N46 units in BMW 1 Series E87 and 3 Series E90 models with a manual transmission. The set includes the DME engine control unit, the CAS2 module, and a matched key, which facilitates the restoration of proper powertrain electronics operation after a failure or engine replacement. This solution allows for consistent management of the powertrain and immobilizer system without the need for costly programming from scratch.

Specifications and technical data

• SKU: 7557290-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7565301
• Substitutable numbers: 12147565301, 7565301, 12147557290, 7557290, 0261201106, 0 261 201 106, 61356981416, 6981416
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS2 + key set

The presented set is part of the Electronic control modules and ECUs category, responsible for coordinating the operation of the 150 HP N46 petrol engine and authorizing the start-up. The DME controller manages, among other things, fuel injection, ignition, and engine auxiliary equipment, while the CAS2 module works with the key to handle immobilizer functions and ignition authorization. Combining these components into one set minimizes the risk of software compatibility issues and security synchronization problems.

Benefits of using a complete set

Using a complete ECU set with a CAS2 module and key is particularly beneficial when:

• replacing a damaged engine control unit or CAS2 module,
• performing an engine swap within the same engine family,
• resolving immobilizer issues and vehicle start-up failures.

Since the components come from a single system, the need for deep software intervention and time-consuming component matching is reduced. This is a practical solution for workshops specializing in BMW electronics and for users who want to restore the efficiency of the engine control system in an organized manner.

Compatibility with the powertrain and transmission

The set has been prepared for BMW 1 Series E87 and 3 Series E90 vehicles with the 150 HP N46 engine and a manual transmission. Proper matching to the transmission version is crucial for the correct interaction of the controller with other vehicle modules, such as safety systems or the drivetrain. Before installation, it is recommended to verify compatibility using the OEM number and interchangeable numbers based on service documentation or manufacturer catalogs.

Condition, verification, and installation

The product comes from a used vehicle, which in practice means it is an original BMW component with factory specifications. Such elements are preferred by workshops due to the preservation of operating parameters close to factory standards and the ability to integrate with the existing vehicle installation. During installation, it is important to follow the manufacturer's procedures, including proper wiring connection, potential adaptation in the vehicle, and diagnostic error checking after starting the engine.

Technical support and selection by OEM/VIN

Selecting the right ECU set for a specific BMW unit requires taking into account the OEM number, interchangeable numbers, and vehicle configuration. To better understand the principles of selecting used controllers and sensors, it is worth using the Global Parts guide – it discusses hardware and software compatibility issues in detail, as well as practical aspects of installation. More information can be found in the article Used automotive electronics – a guide to ECU modules and second-hand sensors.

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