BMW E87 E90 E91 118i 318i N46 129HP ECU Kit DME 7565300 + CAS2 + Key Automatic

BMW E87 E90 E91 118i 318i N46 129HP ECU Kit DME + CAS2 + Key Automatic is a complete engine control kit designed for BMW 1 Series and 3 Series models equipped with the 129 HP N46 engine and an automatic transmission. The kit includes the engine control unit (ECU), the CAS2 module, and a matched key, which facilitates the restoration of proper drivetrain operation following an electronic failure. This solution is particularly useful when replacing a damaged controller or performing advanced electrical system repairs.

Specifications and technical data

• SKU: 7565300-20
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7565300
• Substitutable numbers: 7565300, 12147565300, 7565301, 12147565301, 7561891, 12147561891, 7550867, 12147550867, 7550857, 12147550857, 7568658, 12147568658, 7550869, 12147550869, 7568646, 12147568646, 4834203, 12144834203, 0261201160, 61356964051, 6964051
• Gearbox type: Automatic
• ECU type: Engine Control Unit
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented kit belongs to the Electronic control modules and controllers category and plays a key role in managing the operation of the 129 HP N46 petrol engine. The Engine Control Unit is responsible for precise fuel metering, ignition timing, idle speed control, and communication with the vehicle's safety and comfort systems.

The inclusion of the CAS2 module and a matched key ensures the integrity of the immobilizer system, which significantly simplifies the installation process in BMW E87, E90, and E91 vehicles. This helps avoid the time-consuming process of programming the entire security system from scratch, effectively reducing vehicle downtime.

Compatibility with automatic transmission

The kit has been prepared for use with an automatic transmission, which is essential for proper communication between the engine controller and the transmission control module. A correctly selected ECU for an automatic version ensures stable gear shifting, appropriate responses to load, and the correct operation of functions such as kick-down or driving modes.

In practice, this means that when replacing a damaged controller in automatic transmission models, you can maintain the factory drivetrain performance characteristics without unwanted CAN communication errors or gear-shifting logic issues.

Advantages of using an original BMW kit

The ECU kit with CAS2 and key comes from BMW, which translates into factory-fit compatibility with the electrical installation and network architecture of E87, E90, and E91 models. The original control module is tuned for the specific 129 HP N46 unit, ensuring that engine performance characteristics remain consistent with the manufacturer's specifications.

The main benefits of using a complete kit include:

• immobilizer system consistency thanks to the combination of DME, CAS2, and key,
• reduction of programming scope to the absolute minimum,
• preservation of factory engine and automatic transmission operating parameters,
• easier future diagnostics due to compatibility with factory service software.

Condition, verification, and practical application

This item comes from the used Electronic control modules and controllers segment, allowing for economical vehicle repair while maintaining the original system architecture. Before installation, standard vehicle electrical system diagnostics and verification of the kit's compatibility with the specific equipment version are recommended.

In workshops specializing in the BMW brand, such a set is often used for repairs following ECU water damage, thermal damage, or immobilizer communication issues. A correctly selected and configured kit allows for the restoration of full vehicle functionality without the need for deep interference with the wiring harness.

Expanding the BMW control system

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other components from the same group, such as additional controllers, auxiliary modules, or engine management systems, check out the available parts in the BMW Electronic control modules and controllers category.

To compare how manufacturers approach maintaining brand character in the context of electronics and original components, it is worth reading the article on our blog: Audi and pure emotion – how used parts help maintain the brand's DNA. It provides a better understanding of why using original control modules is just as important for BMW.