BMW E87 E90 120i 320i N46 ECU Engine Control Kit DME 7550534 CAS2 Key Automatic

BMW E87 E90 120i 320i N46 ECU Engine Control Kit DME CAS2 Key Automatic is a complete engine control kit designed for selected BMW 1 and 3 Series models equipped with the N46 engine and an automatic transmission. The kit includes the DME engine control unit, the CAS2 module, and a matched key, which facilitates professional replacement of the control system without the need to source components separately. It is a practical solution for workshops and users looking to restore the proper operation of the engine and immobilizer system in their BMW.

Specifications and technical data

• SKU: 7550534-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557291
• Substitutable numbers: 12147557291, 7557291, 12147552177, 7552177, 12147552176, 7552176, 12147550535, 7550535, 12147550534, 7550534, 12147545043, 7545043, 12147545042, 7545042, 12147531846, 7531846, 0261208582, 0 261 208 582, 61356964051, 6964051
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and compatibility of the ECU kit

The presented engine control kit is dedicated to BMW 1 Series E87 and 3 Series E90 vehicles in 120i and 320i versions with the N46 engine and automatic transmission. The combination of the DME controller, CAS2 module, and key ensures software consistency and compatibility with the vehicle's factory security system. This allows for the efficient restoration of drivetrain functionality following an electronics failure or when replacing a damaged controller.

Kit construction and DME controller functions

The set includes an electronic DME engine controller responsible for precise management of the N46 unit, a CAS2 module handling key authorization and the immobilizer, and a key matched to this specific set. This configuration allows for maintaining the integrity of the vehicle's starting system, synchronization with the automatic transmission, and proper communication with other modules in the vehicle's network. Electronic control modules and controllers of this type are responsible for, among other things, fuel injection, ignition, idle speed control, and cooperation with OBD diagnostic systems.

Benefits of using a complete DME + CAS2 + key kit

Using a complete engine control kit offers a number of practical benefits:

• minimizing issues with matching the immobilizer and key,
• consistency of configuration between the DME controller and the CAS2 module,
• simplified adaptation procedure in vehicles with an automatic transmission,
• possibility of faster diagnostics and vehicle startup after replacing damaged electronics.

For workshops specializing in the BMW brand, such a kit is a convenient, technically sound solution that reduces repair time and limits the risk of component incompatibility. The completeness of the kit translates into a more predictable installation and configuration process.

Professional installation and technical aspects

Due to the complexity of the DME/CAS2 system and its integration with the automatic transmission, installation in a specialized service center equipped with appropriate BMW diagnostic software is recommended. During installation, it is necessary to verify the compatibility of the hardware and software versions with the specific vehicle, as well as to perform adaptation procedures. Proper configuration ensures stable operation of the N46 engine, correct communication with other modules, and the absence of errors in the controller's memory.

Condition, origin, and selection by part numbers

The offered kit belongs to the group of used electronic control modules, which allows for economical repair while maintaining original BMW specifications. Before installation, it is worth verifying compatibility by OEM number and interchangeable numbers, as well as matching the kit to the specific vehicle equipment configuration. Proper selection of components limits the risk of communication issues in the CAN bus and with the immobilizer system.

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

To better understand how to safely choose used engine controllers, CAS modules, and other electronic components, it is worth reading the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. You will find practical tips there regarding selection by OEM numbers, compatibility, and installation.