BMW E60 LCI E90 E91 325d 525d Engine M57N2 197HP ECU Kit DDE 7806987 CAS3 + Keys

BMW E60 LCI E90 E91 325d 525d Engine M57N2 197HP ECU Kit DDE CAS3 + Keys is a complete engine control kit for BMW 3 Series and 5 Series models equipped with the 197 HP M57N2 engine. The set includes the DDE controller, CAS3 module, and matched keys, which facilitates restoring the proper operation of the drivetrain after an electronic failure. This solution is intended for workshops and users expecting a consistent, factory-spec set of electronic components.

Specifications and technical data

• SKU: 7806987-6
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7806987
• Substitutable numbers: 7806987, 13617806987, 8509034, 13618509034, 7811151, 13617811151, 7806380, 13617806380, 7809941, 13617809941, 7806152, 13617806152, 8506951, 13618506951, 7805288, 13617805288, 7808314, 13617808314, 7804845, 13617804845, 0281014436, 61356943834, 6943834
• Category: ECUs & Computer Modules

Application and compatibility with the M57N2 engine

The presented ECU kit is designed for BMW 3 Series E90/E91 325d and 5 Series E60 LCI 525d vehicles equipped with the 197 HP M57N2 engine. Combining the DDE controller with the CAS3 module and keys ensures the consistency of the immobilizer system and engine management, which is crucial when replacing a damaged engine controller or resolving vehicle starting issues.

By maintaining the original BMW architecture, the kit allows for the preservation of correct injection maps, auxiliary equipment logic, and communication with other modules in the vehicle. This is particularly important in advanced diesel units, where precise control of fuel dosage and boost pressure affects refinement, performance, and fuel consumption.

Construction of the DDE ECU + CAS3 + keys kit

The BMW engine controller kit from the Electronic control modules and controllers category includes the DDE controller responsible for engine management, the CAS3 module acting as an anti-theft security feature, and keys matched to this set. Such a configuration minimizes the risk of synchronization issues between the engine controller and the immobilizer system.

Combining these elements into one set facilitates workshop operations: there is no need for tedious matching of individual modules, and the adaptation process to a specific vehicle is simplified. Consistency of the drivetrain electronics translates into stable engine starting, correct communication via the CAN bus, and predictable engine behavior under various load conditions.

Benefits of using an original BMW module

The original BMW ECU kit ensures the preservation of factory M57N2 engine operating parameters without the need for compromise software solutions. For workshops, this means:

• easier diagnostics and coding using standard BMW tools,
• lower risk of conflicts with other electronic modules in the vehicle,
• the ability to restore factory settings without interfering with the wiring harness construction.

Used condition means that the components come from dismantling, which is a frequently chosen solution for economical repairs of premium segment vehicles. With proper installation and configuration, such a kit allows for effectively resolving problems with a damaged engine controller or a faulty CAS system.

Professional installation and vehicle integration

Due to the complexity of the BMW 3 and 5 Series electronic architecture, it is recommended that the kit be installed by a workshop with experience in the BMW brand and access to appropriate diagnostic software. Correctly assigning the kit to a specific vehicle, including CAS3 configuration and monitoring communication with other modules, is key to trouble-free operation.

A properly selected and configured DDE ECU kit with CAS3 module and keys allows you to avoid common problems such as communication errors, lack of response to the key, or unstable idle speed. This solution is particularly useful for repairs after controller flooding, mechanical damage, or unsuccessful software modification attempts.

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 light controllers, check the available parts in the BMW electronic control modules and controllers category.

More about BMW 3 and 5 Series electronics

When working with electronics in BMW 3 and 5 Series, it is worth knowing the relationships between the engine controller, comfort modules, iDrive system, and body modules. Well-selected parts from dismantling allow for significantly reducing repair costs while maintaining the proper functionality of the vehicle. If you want to better understand how to safely use used modules and how to ensure their proper integration with the car, read the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models using parts from dismantling?.