BMW E90 E91 LCI N47N 320d Engine ECU KIT DDE CAS 3 + Key 8510829 Automatic

BMW E90 E91 LCI N47N 320d Engine ECU KIT DDE CAS 3 + Key Automatic is a complete engine control set designed for facelifted BMW 3 Series models equipped with the N47N 320d engine and an automatic transmission. The kit includes the DDE engine control unit, the CAS 3 module, and a matched key, which facilitates restoring the electronic system's functionality after a failure or engine replacement. By maintaining component consistency, the set provides a practical service solution for professional workshops and advanced users.

Specifications and technical data

• SKU: 8510829-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8510829
• Substitutable numbers: 13618519671, 8519671, 13618518272, 8518272, 13618515081, 8515081, 13618512291, 8512291, 13618506566, 8506566, 13618510829, 8510829, 0281017024, 0 281 017 024, 61359237047, 9237047
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU DDE + CAS 3 + key kit

The presented set belongs to the Electronic control modules and ECUs category and is dedicated to the BMW powertrain with the N47N 320d engine. The DDE controller is responsible for precise management of the engine's operation, fuel dosing, boost control, and interaction with other vehicle systems. The CAS 3 module acts as an anti-theft and start authorization security system, and the included key is factory-paired with it, which significantly simplifies the adaptation process in the car. A set configured in this way is particularly useful in situations where the original controller has been damaged, there are issues with the immobilizer, or it is necessary to replace the entire engine control system. Using a consistent set minimizes the risk of software conflicts and speeds up diagnostic work.

Compatibility with automatic transmission

The offered kit has been prepared for use with an automatic transmission, which is crucial for proper communication between the engine controller and the transmission control module. Proper matching of the DDE software to the transmission type affects:

• correct gear shift points and smooth automatic operation,
• coordination of engine torque with transmission control logic,
• stability of driver assistance systems that depend on ECU data. As a result, this set is suitable for users who want to restore the factory powertrain performance characteristics in a BMW E90/E91 LCI 320d with an automatic transmission, without the need for extensive software modifications.

Application in service practice

The ECU DDE kit with the CAS 3 module and key is suitable for professional workshop applications, especially for:

• replacing a damaged engine controller after an electrical failure or water damage,
• issues with start authorization and immobilizer errors,
• engine swaps within the same generation of N47N 320d units. Using an OEM set allows for maintaining the vehicle's original electronic architecture, which facilitates subsequent diagnostics using factory service tools. This solution is particularly valued by workshops specializing in the BMW brand, where component consistency and predictable system behavior are essential.

Product characteristics and condition

The offered set comes from a BMW vehicle and is part of the original line of controllers used factory-standard in E90/E91 LCI 320d models. The product is used, which means that a standard diagnostic procedure and potential software matching to the specific car (coding, synchronization with other vehicle modules) are recommended before installation. To facilitate identification in the store system, the set has an assigned SKU and OEM part number, as well as related interchangeable numbers, which help verify compatibility with a specific car configuration. Information about the transmission type helps avoid mistakes when selecting a controller for an automatic version.

Technical support and selection of used electronics

When selecting used engine controllers and comfort modules, it is crucial to properly check compatibility based on OEM numbers and software. A detailed discussion of selection principles, compatibility verification methods, and practical examples can be found in the Global Parts guide: Used automotive electronics – second-hand ECU modules and sensors. This is a valuable source of knowledge for mechanics and informed users planning the installation of used modules. 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 engine controllers, comfort modules, or transmission controllers, check the available parts in the BMW electronic control modules and ECUs category.