BMW 3 5 Series E60 LCI E90 E91 325d 525d M57N2 ECU Kit DME CAS3 + Key 7806987

BMW 3 5 Series E60 LCI E90 E91 325d 525d M57N2 ECU Kit DME CAS3 + Key is a complete engine control and immobilizer set designed for selected BMW 3 and 5 Series models with the M57N2 engine. The kit includes the DME module, CAS3 module, and a matched key, which facilitates restoring the proper operation of the electronic system after a failure or when replacing the ECU. This solution allows for a consistent match of powertrain electronics in one well-selected set.

Specifications and technical data

• SKU: 7806987-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7806987
• Substitutable numbers: 13617809941, 7809941, 13618509034, 8509034, 13617811151 13617806380 13617806987 13617806152, 7811151 7806380 7806987 7806152, 13618506951 13617805288 13617808314 13617804845, 8506951 7805288 7808314 7804845, 61359147195, 9147195
• Category: ECUs & Computer Modules

Purpose of the ECU DME CAS3 + Key kit

The set is dedicated to BMW 3 Series E90/E91 and BMW 5 Series E60 LCI vehicles with the M57N2 diesel engine in 325d and 525d versions. Combining the DME engine control unit with the CAS3 module and the key ensures consistency of immobilizer data, which is crucial when replacing electronics in vehicles of this generation. This allows for effectively resolving issues with engine starting, communication errors in the CAN network, or improper operation of the fuel injection system resulting from a damaged controller.

Function and role in the BMW electronic system

As an element from the Electronic control modules and ECUs group, this set is responsible for:

• managing the operation of the M57N2 engine (fuel dosage, boost pressure, injector operating parameters),
• start authorization through the cooperation of the CAS3 module with the key and the DME controller,
• communication with other vehicle modules on the data bus,
• maintaining factory security logic and operating comfort. Combining these elements into one set reduces the risk of coding and synchronization problems, which in practice shortens repair time and facilitates workshop work.

Benefits of using an original BMW module

The original module from the BMW Electronic control modules and ECUs group ensures compatibility with the vehicle's factory electrical architecture and predictable behavior of all systems related to the engine. Compared to replacements or individual, unmatched controllers, the complete DME + CAS3 + key set:

• minimizes the need for deep programming and adaptation,
• reduces the risk of conflicts with other comfort and safety modules,
• facilitates diagnostics – operating parameters are read according to factory maps and data structure. This solution is particularly beneficial for workshops specializing in the BMW brand that expect stable, predictable electronic performance after repair.

Condition characteristics and use in service practice

The item comes from a used vehicle, which in service practice means the possibility of an economical repair while maintaining the manufacturer's original specifications. The set is particularly useful in situations where there has been damage to the engine controller, problems with the CAS3 module, or loss of synchronization between the key and the vehicle's electronics. In one set, you receive a base for restoring the proper operation of the powertrain without the need to search for individual, random components.

Selection, compatibility, and technical support

When selecting such advanced elements as the ECU DME CAS3 + Key kit for BMW, it is crucial to pay attention to compatibility with the specific engine version, model year, and vehicle equipment. Proper matching allows you to avoid problems with coding, communication errors, and unnecessary assembly and disassembly costs. In case of doubt, it is worth using the knowledge of specialists and service documentation to ensure that the selected set corresponds to the configuration of the given car. If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements 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. For those who want to better understand how original control modules influence the driving character and behavior of a premium class car, an article describing the role of factory components in maintaining the Audi brand DNA may be helpful – you can find it here: Audi and emotions in their purest form – how used parts help maintain the brand's DNA. If you want to deepen your knowledge on the safe selection of used electronic modules and other components, it is worth reading the expert guide: how to professionally select used car parts, saving time and nerves.