BMW 1 3 Series E81 E87 LCI E90 N47 120d 320d 177HP ECU Kit DDE 7811700 CAS3 Key

BMW 1 3 Series E81 E87 LCI E90 N47 120d 320d 177HP ECU Kit DDE CAS3 Key is an original engine control module designed for BMW models equipped with the N47 engine and an automatic transmission. As a component from the Electronic control modules and controllers category, it is responsible for precise engine management, fuel injection, and communication with the automatic transmission. A used OEM controller is a sensible choice for a conscious repair, allowing you to maintain the factory performance characteristics of the drivetrain.

Specifications and technical data

• SKU: 7811700-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811700
• Substitutable numbers: 1361851258713617811700028101504361359147220, 8512587781170002810150439147220, 0281015043, 13618506199, 8506199, 13617812500, 7812500, 13617812000, 7812000, 13617811700, 7811700, 13617810000, 7810000, 13617809000, 7809000, 13617808401, 7808401, 13617807827, 7807827, 13617807530, 7807530, 13617807200, 7807200, 13617807142, 7807142, 13617806699, 7806699
• Category: ECUs & Computer Modules

Purpose and function of the controller

The presented engine computer is dedicated to the BMW 1 Series E87 LCI and 3 Series E90 with the N47 engine paired with an automatic transmission. The controller plays a key role in managing engine operating parameters, such as fuel dosage, boost pressure, or injection corrections, as well as coordinating communication with other vehicle modules. This ensures stable engine operation, smooth gear shifts, and compliance with factory control maps.

Advantages of using an original BMW module

Choosing an original BMW controller from the Electronic control modules and controllers category ensures the preservation of the factory operating logic for all vehicle systems. The module is designed to work with the car's communication bus, which facilitates integration with the existing electrical installation and other controllers. In practice, this means predictable drivetrain behavior, no communication issues between modules, and the ability to perform proper diagnostics using factory service tools. An additional benefit is the ability to match the controller by OEM number and available interchangeable numbers, which makes it easier to select the correct unit for a specific vehicle configuration. This helps reduce the risk of hardware or software incompatibility and shortens repair time.

Professional selection and compatibility

To ensure proper system operation, it is essential to match the engine computer to the specific BMW E87 LCI or E90 N47 with an automatic transmission. In practice, this means verifying the OEM part number and related reference numbers, as well as comparing the hardware and software versions with the previously installed module. Such an approach minimizes the risk of communication errors, starting problems, or improper transmission operation. In many cases, after installation, it is necessary to perform adaptation procedures or programming using appropriate diagnostic software. This allows the controller to be synchronized with the immobilizer, instrument cluster, and other comfort and safety modules.

Condition, origin, and practical application

The offered BMW engine computer comes from dismantling and is a used component, which provides a cost-effective solution while maintaining original OEM quality. Such modules are frequently chosen by both workshops specializing in the BMW brand and individual users looking for a proven alternative to unreliable aftermarket replacements. A used OEM controller allows for an economical repair without sacrificing the factory operating parameters of the engine and automatic transmission. Due to the nature of this electronic component, it is recommended to have it installed and, if necessary, coded at a specialized service center that has the appropriate diagnostic equipment and experience in working with BMW control modules.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the engine and control system area in your BMW and need other components from the same group, such as engine controllers, transmission modules, or other ECU units, check out the available parts in the BMW electronic control modules and controllers category. To better understand how to safely select and install a used engine computer, it is worth checking out the practical Global Parts guide – it discusses in detail how to select parts by OEM number, compatibility issues, and installation procedures: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.