BMW Z4 E89 Roadster 18i N20 156HP ECU Kit DME CAS3 + Key 8631727 Manual

BMW Z4 E89 Roadster 18i N20 156HP ECU Kit DME CAS3 + Key is a complete control set from the Electronic control modules and controllers group, designed for the petrol version with a manual transmission. The set allows for a professional replacement of key engine electronics and immobilizer components, maintaining the characteristic properties of the N20 unit and the consistency of BMW onboard systems.

Specifications and technical data

• SKU: 8631727-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8631727
• Substitutable numbers: 12148661466 0261S10553 61359287535, 8661466 0 261 S10 553, 9287535, 12148610678, 12148617569, 12148602914, 12148631727, 12148603576, 8610678, 8617569, 8602914, 8631727, 8603576
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS3 kit

The presented ECU DME CAS3 kit is dedicated to the BMW Z4 E89 Roadster 18i with the N20 156HP engine and manual transmission. It includes components responsible for controlling the powertrain operation and ignition authorization, which enables a consistent replacement of electronics without the need for tedious matching of individual modules.

In practice, this means the ability to perform tasks such as:

• restoring the correct operation of the engine control system after a factory controller failure,
• replacing a damaged DME/CAS3 set with a solution matched to a specific drivetrain configuration,
• reducing communication issues between the engine controller and the vehicle's security system.

Benefits of using an original BMW module

Using an original set from the Electronic control modules and controllers BMW group allows you to maintain the factory operating logic of the N20 engine, including throttle response characteristics, unit protection strategy, and cooperation with other vehicle systems. This is particularly important in the Z4 E89 model, where control precision has a direct impact on the perceived dynamics and refinement of the powertrain.

The most important advantages include:

• software consistency with the electrical architecture of the BMW Z4 E89 Roadster 18i,
• maintaining proper cooperation with the manual transmission,
• the possibility of professional repair without interfering with modifications not intended by the manufacturer.

Technical characteristics in the context of the powertrain

The set has been prepared for the N20 petrol unit, which means it is matched to the specific requirements of a turbocharged engine in terms of ignition control, fuel dosing, and thermal protection strategy. The configuration for a manual transmission ensures proper torque management and cooperation with driver assistance systems.

Thanks to this solution, you can:

• maintain compliance of engine operating parameters with BMW factory specifications,
• minimize the risk of communication errors between control modules,
• restore full functionality of the powertrain after damage to the previous controller.

Condition, verification, and practical application

The item comes from a used vehicle, which allows for an economical restoration of the control system's efficiency while maintaining the original BMW specification. Such sets are frequently used in professional workshops specializing in the brand, where both hardware compatibility and the possibility of further configuration using factory diagnostic tools are valued.

By choosing this product, you gain:

• a complete set of components enabling a consistent replacement of control electronics,
• a solution matched to a specific engine and transmission version,
• a base for further adaptation and coding within standard BMW service procedures.

If you are planning a comprehensive repair or upgrade of the engine electronics area in your BMW and need other components from the same group, such as engine controllers, comfort modules, or security control units, check the available parts in the BMW Electronic control modules and controllers category.

For a better understanding of how original control modules influence driving characteristics and the behavior of a premium brand, it is worth reading the article on our blog: Audi and emotions in their purest form – how used modules and electronic components help maintain the brand's DNA.