BMW 3 5 Series E60 LCI E90 E91 325d 525d M57N2 ECU Kit DME CAS3 + 2 Keys 7806987

BMW 3 5 Series E60 LCI E90 E91 325d 525d M57N2 ECU Kit DME CAS3 + 2 Keys is a complete control unit set designed for the M57N2 engine in selected BMW 3 and 5 Series models. The set includes the DME engine control unit, the CAS3 module, and two keys, allowing for seamless, factory-standard integration of the vehicle's electronic components. This solution is particularly useful when replacing a damaged control unit or during advanced electronic system repairs.

Specifications and technical data

• SKU: 7806987-4
• 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, 0281014436 61356943834, 0 281 014 436 6943834
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS3 kit

This set is dedicated to BMW 3 Series E90/E91 and 5 Series E60 LCI vehicles equipped with the M57N2 engine. Combining the DME engine control unit with the CAS3 module and paired keys ensures consistent operation of the starting system, immobilizer, and engine management. This allows for the restoration of original control logic without the need for time-consuming adaptation of individual components.

A kit of this type is highly valued in workshops specializing in BMW electronics, as it reduces the risk of synchronization issues between the control unit, comfort module, and keys. Electronic control modules and ECUs provided as a ready-to-use set shorten diagnostic and installation time, leading to more efficient service for the customer's vehicle.

Benefits of using the complete DME + CAS3 + 2 keys kit

Using a complete control kit offers a number of practical advantages in daily workshop operations and vehicle maintenance:

• electronic consistency – the DME, CAS3, and keys are matched, facilitating vehicle startup after installation,
• reduction of immobilizer issues – lower risk of errors related to key authorization and starting blocks,
• faster repair process – no need for time-consuming programming of individual modules,
• preservation of M57N2 engine performance characteristics in line with factory specifications,
• suitability for advanced electronic repairs, retrofits, or replacing a damaged control unit.

For workshops specializing in the BMW brand, such a kit is a practical solution that optimizes working time and increases the predictability of the final result. A used ECU kit with a CAS3 module is also an economically attractive alternative to purchasing new components.

Condition, verification, and selection by part numbers

This item belongs to the Electronic control modules and ECUs category and is offered as a used part, which is an important factor when planning a repair budget. Before installation, a standard diagnostic procedure and verification of compatibility with the specific vehicle configuration, including engine type and model year, are recommended.

To select the correct ECU kit for your BMW, it is advisable to use the OEM number, interchangeable part numbers, and the vehicle's VIN. A practical step-by-step guide may be helpful – you can find it in the article how to choose the right car part by VIN and OEM number, which discusses how to verify compatibility and lists questions worth asking the seller.

Application in service and modernization projects

The complete ECU DME kit with the CAS3 module and two keys is suitable for both professional workshops and specialized modernization projects. It can be used for, among other things:

• replacing a damaged engine control unit in BMW vehicles with the M57N2 engine,
• repairs following unsuccessful programming or tuning attempts,
• restoring functional electronic configuration after a collision or body replacement,
• vehicle reconstruction projects where maintaining original control logic is crucial.

Because the set includes two keys, the user gains convenience and the ability to keep a spare key without the need for additional duplication later. This is a practical solution for both the car owner and the workshop handing over the vehicle after repair.

Expanding knowledge and other BMW modules

If you are planning a comprehensive repair or modernization of the control electronics in your BMW and need other components from the same group, such as engine control units, comfort modules, or security management units, check out the available parts in the BMW electronic control modules and ECUs category.

For a comparison of how premium manufacturers approach maintaining brand character, you can read the blog article Audi and pure emotion – how used parts help maintain the brand's DNA, which shows how original electronic modules influence the consistency of the driving experience in premium class vehicles.