BMW E87 E90 LCI 118d 318d N47 Diesel ECU KIT DDE 7811701 + CAS3 + Key Automatic

BMW E87 E90 LCI 118d 318d N47 Diesel ECU KIT DDE + CAS3 + Key Automatic is a complete set from the Electronic control modules and controllers category, designed for BMW vehicles equipped with the N47 diesel engine and an automatic transmission. The kit includes the DDE engine control unit, the CAS3 module, and a matched key, which significantly facilitates restoring the drivetrain's functionality or replacing damaged electronics in 1 Series and 3 Series facelift models.

Specifications and technical data

• SKU: 7811701-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811701
• Substitutable numbers: 13618506281, 8506281, 13617812501, 7812501, 13617810001, 7810001, 13617811701, 7811701, 13617807143, 7807143, 13617807204, 7807204, 13617812001, 13617809001, 13617807828, 13617807529, 13618508712, 13617808403, 13617806700, 0281015042, 61359147220, 9147220
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose of the DDE ECU + CAS3 + Key kit

This set is dedicated to BMW E87 and E90 LCI models with the N47 diesel engine and automatic transmission. Combining the DDE controller with the CAS3 module and a matched key allows for consistent operation of the immobilizer, engine start, and communication with other vehicle systems, which is particularly important when replacing a faulty controller or the complete ignition electronics.

Benefits of using a complete ECU KIT

Using a complete ECU KIT in a BMW with an N47 engine ensures:

• software and coding consistency between the DDE controller and the CAS3 module,
• minimization of issues related to the immobilizer and key authorization,
• simplified installation procedure compared to replacing individual components,
• maintenance of proper cooperation with the automatic transmission and onboard systems.

As a result, this kit is particularly useful for repairs following engine electronics failure, starting issues, or unsuccessful attempts at reprogramming controllers.

Technical characteristics and vehicle integration

As an item from the Electronic control modules and controllers category, the DDE ECU + CAS3 + Key kit is designed to operate within the vehicle's communication network, including data buses and safety systems. The DDE controller is responsible for precise control of the diesel engine, including fuel dosing, boost control, and cooperation with exhaust gas treatment systems, while the CAS3 module manages key authorization, the start/stop function, and anti-theft protection.

The version intended for cars with an automatic transmission is adapted to the requirements of the drivetrain, including the exchange of information between the engine controller and the transmission control unit, which is essential for smooth gear shifting and the correct operation of driving modes.

Application in service practice

The complete ECU KIT is particularly useful in workshops specializing in the BMW brand and in services dealing with automotive electronics. It enables:

• efficient replacement of a damaged engine controller along with associated security components,
• reduction of time required for programming and adapting individual modules,
• reduction of the risk of incompatibility between the controller, the CAS3 module, and the key,
• effective repair of vehicles after interference with the electrical installation or after an engine swap.

This solution is beneficial both for professional services and for users looking for a technically consistent set for their BMW with an N47 unit.

Product condition and selection by markings

The offered set comes from the secondary market, which allows for an economical vehicle repair while maintaining the original BMW electronic architecture. When selecting, it is recommended to verify compatibility by OEM part number and interchangeable numbers, as well as to compare the engine configuration and transmission type with your vehicle. In case of doubt, it is worth consulting an automotive electrician or a service specializing in the BMW brand to ensure proper integration of the kit with your specific car.

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

To better understand how to safely choose used engine controllers, CAS modules, and other vehicle electronics, it is worth reading the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?