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 7811700 CAS3 Key is a factory-original electronic control module designed for BMW powertrains with the N47 engine and automatic transmission. As a component from the Electronic control modules and controllers category, it is responsible for precise engine management and communication with the automatic transmission, ensuring stable driving characteristics and proper integration with other vehicle systems. This is the ideal solution for users seeking a proven, original controller rather than universal replacements.

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 BMW 1 Series E87 LCI and 3 Series E90 models equipped with the N47 engine and automatic transmission. Its task is to coordinate engine operating parameters, such as fuel dosage, injection timing, and interaction with the automatic transmission system, to maintain proper dynamics, smooth operation, and compliance with factory manufacturer settings.

As an original BMW module, it ensures proper communication within the vehicle's bus, interaction with other controllers, and adherence to factory logic for safety and comfort systems. This is particularly important in vehicles equipped with complex electronics, where an incorrectly selected controller can cause communication errors or functional limitations.

Benefits of using an original BMW computer

Using a factory controller instead of a damaged or unstable component allows for the restoration of proper powertrain operation without interfering with the electrical installation. Key advantages include:

• Full integration with the vehicle's installation – maintaining the original electrical and logical architecture.
• Stable cooperation with the automatic transmission, resulting in smooth gear shifts.
• Ability to perform proper diagnostics using factory BMW service tools.
• Reduced risk of compatibility issues typical of universal replacements.

For workshops and individual users, this means a more predictable repair process and easier configuration of the controller for a specific vehicle.

Condition, origin, and practical application

The module is sourced from dismantling and is offered as a used original BMW component. Such controllers are frequently chosen by professional service centers because they allow for economical repairs while maintaining factory build quality and compliance with manufacturer software. In many cases, this is the optimal solution between a costly new controller and risky replacements of uncertain origin.

Before installation, standard service procedures should be anticipated, such as matching to the specific vehicle, potential coding, or adaptation depending on the car's configuration. This allows the computer to fully interact with the existing installation, immobilizer, and other modules in the vehicle.

Selection, compatibility, and technical support

Due to the specifics of BMW electronics, when selecting a controller, it is crucial to pay attention to compatibility with the powertrain, model year, and equipment version. This computer is intended for use in vehicles with the N47 engine and automatic transmission, which significantly narrows the search area and facilitates the selection of the correct module.

To better understand when it is worth choosing a used engine controller and how to safely perform such a replacement, it is worth reading the guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. The article discusses practical aspects of selecting electronics, which can be helpful for both workshops and individual users.

If you want to learn more about the subject of used components and dispel doubts regarding their durability and cost-effectiveness, the following material will also be helpful: Used car parts: Myths and facts you need to know. This is a good supplement to your knowledge when planning repairs using original, yet used, components.

Related BMW Electronic control modules and controllers

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