BMW 1 3 Series 2 E87 E90 E91 120i 320i N46 ECU Kit DME CAS2 Key 7545042 Manual

BMW 1 3 Series 2 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 BMW vehicles equipped with the N46 engine and a manual transmission. The kit provides a cohesive engine electronics package, facilitating the professional replacement of a faulty ECU without the need for tedious programming from scratch. This solution is particularly useful for repairs where component compatibility and stable powertrain operation are essential.

Specifications and technical data

• SKU: 7545042-2
• 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, 61356943759, 6943759, 0261208540, 0 261 2085 40
• Gearbox type: Manual
• Category: Control Modules

Purpose and function of the ECU DME CAS2 kit

The presented kit belongs to the Computers and Controllers category and is dedicated to BMW 1 and 3 series models with the N46 engine, in 120i and 320i versions. The set includes a DME controller responsible for managing engine operation, a CAS2 module handling start authorization, and a matched key, creating a cohesive immobilizer and powertrain control system.

This combination of elements allows for maintaining the integrity of the security system while facilitating the installation and adaptation process in the vehicle. The kit is especially useful in situations where the existing controller has suffered electronic damage or there are communication issues between modules.

Benefits of using a complete controller kit

Using a complete ECU kit with CAS2 and key offers a number of practical benefits in the workshop and during service:

• maintained consistency of engine electronics and the immobilizer system,
• reduced risk of software conflicts between modules,
• easier diagnostics and configuration compared to replacing individual components,
• possibility of restoring proper vehicle starting after a controller failure,
• better control over the operating parameters of the N46 engine in petrol versions.

Thanks to this kit, the logic of the factory control system can be restored in an orderly manner, which promotes stable operation of the powertrain and proper cooperation with other modules in the vehicle.

Compatibility with manual transmission

The offered set is configured for a manual transmission, which is significant for how the DME controller interacts with the drivetrain. In vehicles with a manual gearbox, torque control strategies, throttle response, and cooperation with driver assistance systems differ.

Selecting an ECU kit appropriate for the transmission type is crucial for proper engine operation, smooth acceleration, and the correct functioning of features related to safety and driving comfort. Proper matching helps avoid controller errors and unwanted dashboard warning messages.

Product characteristics and service application

As an item from the BMW Computers and Controllers group, this kit is suitable for both professional service centers and specialized workshops dealing with automotive electronics. It can be used for:

• repairs following electrical damage to the engine controller,
• problems with key authorization and vehicle starting,
• engine swaps within the same engine family,
• diagnostics of faults related to DME–CAS2 communication.

The product is marked as used, which in workshop practice often represents a reasonable compromise between repair cost and functionality, especially in the case of older generations of BMW 1 and 3 series.

Why consider used engine electronics

When choosing such a kit, many users wonder about the durability and cost-effectiveness of used electronics. In practice, with proper selection based on the model, engine, and transmission type, a used controller can effectively restore full vehicle functionality and significantly reduce repair costs compared to new components.

If you want to better understand when choosing a used engine controller is a reasonable solution and what to look for when matching modules, check out our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

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 engine controllers, control modules, or powertrain management systems, check out the available parts in the BMW Computers and Controllers category.