BMW E81 E87 E90 LCI 120d 320d N47 ECU Kit DDE 8506374 CAS3 + Keys Manual

Visual condition of the part

The product shows signs of use visible in the photos.

BMW E81 E87 E90 LCI 120d 320d N47 ECU Kit DDE CAS3 + Keys Manual is a complete electronic kit designed for BMW 1 and 3 series models with the N47 engine and manual transmission. The kit includes the DDE engine control unit, the CAS3 module, and matched keys, which facilitates professional control system replacement without the need for tedious programming from scratch. It is a practical solution for workshops and users who want to restore full vehicle functionality in a consistent and technically correct manner.

Specifications and technical data

• SKU: 8506374-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8512498
• Substitutable numbers: 13618512498, 8512498, 13617812538, 7812538, 13618506437, 8506437, 13618510591, 8510591, 13617823421, 7823421, 13618506374, 8506374, 13617823420, 7823420, 13618506438, 8506438, 0281016067, 0 281 016 067, 61359147226, 9147226
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose of the ECU DDE CAS3 + Keys kit

The presented kit is dedicated to BMW 1 Series E81/E87 and 3 Series E90 LCI cars with the N47 diesel engine and manual transmission. The combination of the DDE controller, CAS3 module, and keys ensures immobilizer data consistency, which significantly simplifies the installation and vehicle startup process after repair or replacement of a damaged controller.

A set configured in this way is particularly useful for major engine electronics repairs, when it is necessary to replace several elements simultaneously, and the priority is to maintain correct communication between all modules in the vehicle.

Construction and function of the kit components

The ECU DDE kit with CAS3 module and keys consists of three main components responsible for managing engine operation and start authorization:

• DDE engine controller – responsible for precise control of the N47 unit, fuel dosing, operating parameters, and communication with other vehicle modules,
• CAS3 module – manages the immobilizer function, key authorization, and engine starting procedure,
• keys – work with the CAS3 to enable correct vehicle recognition and unlock the ignition.

Combining these elements into one matched kit reduces the risk of software conflicts and speeds up the diagnostic and installation process in the vehicle.

Compatibility with manual transmission

The kit is prepared to work with a manual transmission, which is important both for the correct configuration of the DDE controller and for the logic of driver assistance systems. As a result, engine operating parameters and communication with other modules are adapted to the characteristics of the manual gearbox, which helps maintain the factory driving feel of the car.

For workshops, this means fewer software corrections and faster restoration of full vehicle functionality after replacing a damaged controller or CAS3 module.

Benefits of using an original BMW module

Using an original BMW electronic control module from the same model group allows you to maintain compliance with the vehicle's factory electrical architecture. This limits the risk of bus communication problems, comfort system errors, or incorrect operation of security functions.

The complete ECU DDE kit with CAS3 and keys is particularly beneficial for repairs following electronics damage, when a consistent, technically correct solution is required without the need for time-consuming matching of individual modules.

BMW electronic control modules and controllers – expansion and service

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

Technical support and best installation practices

When working with advanced BMW electronics, it is worth using proven service procedures and the experience of other users and specialists. Practical tips on diagnostics, programming, and the safe use of used control modules in 3 and 5 series models can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using dismantled parts?.

Combining reliable technical knowledge with a properly selected ECU DDE, CAS3, and keys kit allows for a repair that is predictable, compliant with the manufacturer's specifications, and optimized for the durability of the entire electronic system.