BMW 1 3 Series E87 E90 E91 120i 320i N46 ECU KIT DME CAS 2 key 7557290 Manual

BMW 1 3 Series E87 E90 E91 120i 320i N46 ECU KIT DME CAS 2 key Manual is a complete set from the Electronic control modules and controllers group, designed for the N46 engine in BMW 1 and 3 Series models with a manual transmission. The set allows for a coherent replacement of the engine control unit and immobilizer, which facilitates restoring the proper operation of the powertrain and vehicle starting after an electronics failure.

Specifications and technical data

• SKU: 7557290
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557290
• Substitutable numbers: 12147557290, 7557290, 61356981416, 6981416
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Application of the ECU DME CAS 2 set

The presented ECU set is dedicated to BMW 1 Series E87 and 3 Series E90/E91 vehicles with an N46 engine and manual transmission. Combining the engine controller with the CAS 2 module and a matched key ensures the consistency of the security system and compatibility with the vehicle's factory electrical architecture. A set configured in this way is particularly useful in situations where the original controller has been damaged, there are issues with key authorization, or failed programming attempts have occurred. Using a ready-made set reduces the need for deep software intervention and shortens diagnostic time.

Construction and function of the set components

The ECU KIT includes a DME controller responsible for managing the N46 engine, a CAS 2 module acting as the central element of the immobilizer system, and a matched key. This configuration allows for maintaining data consistency between the engine controller and the security module. In practice, this means that after proper installation and adaptation to a specific car, it is possible to restore starting and stable operation of the powertrain without the need to build the entire configuration from scratch. The completeness of the set facilitates workshop work and reduces the risk of software conflicts between individual modules.

Benefits of use in vehicles with a manual transmission

The presented ECU KIT is intended for vehicles with a manual transmission, which is significant for the proper cooperation of the controller with the drivetrain. Proper matching to the transmission type affects:

• correct handling of signals related to clutch and gear position,
• stable idle speed control,
• consistency of security logic during startup,
• reduction of diagnostic errors resulting from configuration mismatches. Thanks to this, the set is the right basis for repairing engine electronics in BMW cars with a manual gearbox, where maintaining the original operating characteristics of the drivetrain is required.

Workshop purpose and installation

Due to the nature of electronic components and the connection to the immobilizer system, the installation of the set should be carried out by a workshop with experience in working with BMW electronics. Proper vehicle identification, verification of compatibility with the N46 engine, and matching the configuration to the specific car are required. The used nature of the set makes it an economical solution that also allows for maintaining the factory logic of engine control and security. Before installation, it is recommended to perform a full diagnostic to confirm that the cause of the problems is indeed the damage to the original controller or the CAS module.

BMW electronic control modules and controllers – expansion and selection

If you are planning a comprehensive repair or upgrade of the engine electronics area in your BMW and need other elements from the same group, such as additional controllers, comfort modules, or engine management systems, check the available parts in the BMW electronic control modules and controllers category.

Knowledge support and optimization of part selection

When working with control electronics and immobilizers, it is particularly important to understand how original modules affect the car's character and its behavior on the road. In the context of premium brands, an interesting addition to your knowledge might be an article describing how properly selected modules and equipment elements help maintain the vehicle's factory properties – you can find it here: Audi and pure emotion. How do used parts help maintain the brand's DNA?. If you want to reduce vehicle downtime in the workshop and efficiently select further electronics components, it is also worth reading a practical guide on used parts logistics: how a wide assortment in one warehouse affects car repair time.