BMW 1 3 Series 7 E87 E90 E91 120i 320i N46 ECU Kit DME 7545042 CAS2 + Key Manual

BMW 1 3 Series 7 E87 E90 E91 120i 320i N46 ECU Kit DME CAS2 + Key Manual is a complete engine control unit kit with a CAS2 module and key, designed for selected BMW 1 and 3 Series models with the N46 engine and manual transmission. The kit belongs to the Computers and Controllers group, providing a cohesive solution for restoring the proper operation of the engine electronics and immobilizer system. It is a practical choice for workshops and users looking for a factory-fit solution without the need to program the entire system from scratch.

Specifications and technical data

• SKU: 7545042-7
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7545042
• Substitutable numbers: 118i 318i, 12147552177 12147552176 12147550535, 12147550534 12147545043 12147545042, 12147531846, 7552177 7552176 7550535 7550534 754504 75450423, 7531846, 12147557291, 7557291, 61356943767, 6943767, 0261208540, 0 261 2085 40
• Gearbox type: Manual
• Category: Control Modules

Purpose and function of the ECU DME + CAS2 + key kit

The presented control kit is dedicated to BMW 1 Series E87 and 3 Series E90/E91 vehicles with the N46 engine and manual transmission. In one package, you receive the DME controller, the CAS2 module, and a matched key, which allows for a consistent replacement of the entire path responsible for ignition authorization and engine management. This solution significantly facilitates the service process, reducing the need for complex matching of individual electronic components.

By maintaining compatibility between the DME, CAS2, and the key, the kit helps resolve common issues related to a lack of communication between the engine controller and the immobilizer system, difficult starting, or key authorization errors. This is particularly important for vehicles where previous repair attempts involved replacing individual modules without full synchronization.

Benefits of using a complete Computers and Controllers kit

Using a complete kit from the Computers and Controllers group offers a number of practical service benefits:

• consistency of the electronics responsible for ignition and engine operation,
• reduction of the risk of software conflicts between modules,
• faster diagnostics and installation compared to sourcing individual components,
• the ability to effectively repair vehicles after controller damage or immobilizer issues.

For workshops specializing in the BMW brand, such a kit is a convenient solution that allows for reduced vehicle downtime and optimized repair costs. For the end user, it means greater predictability of the service outcome and more stable operation of the powertrain.

Compatibility with manual transmission

The discussed kit is intended for vehicles equipped with a manual transmission. This is crucial when selecting a DME controller, as the software configuration and system logic differ depending on the transmission type. Choosing the correct variant for the specific vehicle specification minimizes the risk of errors, incorrect readings, and communication problems between the engine controller and other vehicle modules.

Before installation, it is recommended to verify vehicle compatibility in terms of body generation, N46 engine type, and the transmission used, in order to fully utilize the potential of the kit and avoid additional software modifications.

Product characteristics and service application

The product is marked as a used original BMW part, which in practice means a factory fit for the vehicle's electrical installation and network architecture. For many users and service centers, this is a reasonable compromise between cost and functionality, allowing for the restoration of full engine control system efficiency without investing in a new, expensive module.

The kit will prove particularly useful in situations where:

• the original DME controller has suffered electrical or software damage,
• there are starting issues related to the CAS2 module or the key,
• it is necessary to replace the complete control path after tampering with the vehicle's electronics.

Because all key components are included in one package, the process of restoring the vehicle's functionality is more predictable and organized.

More solutions from the BMW Computers and Controllers category

If you are planning a comprehensive repair or upgrade of your BMW's engine electronics and need other components from the same group, such as DDE/DME controllers, CAS modules, or other ECU controllers, check out the available parts in the BMW Computers and Controllers category.

How to consciously choose used BMW electronics

When selecting a used ECU kit with a CAS2 module and key, it is worth paying attention to the compatibility of the vehicle generation, engine type, and transmission type. It is also important that the components come from the same car, which increases the chances of seamless operation after installation. A good practice is to perform full diagnostics after installation to confirm proper communication of all modules within the vehicle network.

If you want to better understand when choosing a used engine controller or comfort module makes sense and how to minimize risks during such repairs, check out our guide The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, where you will find practical tips on selecting and installing automotive electronics.