BMW 3 Series E90 E91 LCI N47N 320d 184HP ECU KIT DDE CAS 3 Key 8512291 Manual

BMW 3 Series E90 E91 LCI N47N 320d 184HP ECU KIT DDE CAS 3 Key is an original electronic control module designed for the BMW powertrain with the N47N engine. This component is responsible for precise engine management and cooperation with the CAS3 system, ensuring stable communication within the vehicle's network. Thanks to its factory design, this ECU is the right choice for professional repairs or controller replacements in vehicles with a manual transmission.

Specifications and technical data

• SKU: 8512291-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8512291
• Substitutable numbers: 13618519671, 8519671, 13618518272, 8518272, 13618515081, 8515081, 13618512291, 8512291, 13618506566, 8506566, 13618510829, 8510829, 61359226238, 9226238, 0281017446, 0 281 017 446
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the controller

The presented engine controller is designed to work with the N47N unit in BMW 3 Series E90/E91 LCI (facelift) models in the 320d 184HP version. As a part of the Electronic control modules and controllers group, it is responsible for monitoring engine operating parameters, such as fuel dosage, injection timing, and accessory support, as well as exchanging data with the CAS3 system responsible for ignition authorization.

The module is intended for vehicles equipped with a manual transmission, which is crucial when selecting the correct ECU version in terms of software and vehicle configuration.

Benefits of using an original BMW module

Using a factory controller in a BMW E90/E91 LCI with an N47N engine allows for maintaining the consistency of the vehicle's electronics and reducing the risk of communication issues on the CAN bus. The original module ensures:

• proper cooperation with the CAS3 system and other controllers in the vehicle,
• preservation of factory engine control strategies,
• the possibility of professional matching by OEM number and interchangeable numbers,
• easier diagnostics using dedicated BMW service software.

For workshops and users, this means more predictable vehicle behavior after repair and a higher chance of seamless controller adaptation after installation.

Selection, compatibility, and installation

To correctly select the BMW 3 Series E90 E91 LCI N47N 320d 184HP ECU KIT DDE CAS 3 Key, it is crucial to compare the OEM number and interchangeable numbers with the vehicle data, as well as to consider the transmission type. In this case, the module is intended for configurations with a manual gearbox, which must be taken into account when planning the replacement.

Before installation, it is recommended to:

• verify compatibility by part number and vehicle equipment,
• plan the programming / matching procedure with the CAS3,
• perform diagnostics after installation to check for errors and operating parameters.

This approach helps reduce vehicle downtime and increases the chance of a smooth startup after replacing the controller.

Condition and practical application

The module comes from the BMW group and is a used component, which in workshop practice often represents a reasonable compromise between repair costs and maintaining the vehicle's original electronics. With proper selection and professional installation, it can be effectively used both for routine repairs and for rebuilding vehicles after collisions or engine control system failures.

Because the controller is a factory BMW component, compatibility with the car's original electrical and logical architecture is maintained, which is important for the stability of the entire powertrain.

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 CAS units, check out the available parts in the BMW electronic control modules and controllers category.

More about used BMW electronics

When working with used ECU controllers and CAS3 modules, issues such as selection by numbers, hardware and software compatibility, and the correct installation procedure are particularly important. To better plan the replacement of such a component and avoid common mistakes, it is worth reading the practical guide on our blog: Used automotive electronics on board – why choose second-hand ECU modules and sensors?.