BMW E81 E87 LCI E90 116i 316i N45N ECU Kit DME CAS3 + Keys 7581848 Manual

BMW E81 E87 LCI E90 116i 316i N45N ECU Kit DME CAS3 + Keys Manual is a complete engine control and immobilizer kit designed for petrol versions of BMW 1 Series and 3 Series with a manual transmission. The set includes the DME engine control unit, the CAS3 module, and matched keys, which facilitates seamless adaptation of the powertrain electronics. It is a practical solution for replacing a damaged control unit or for advanced electronic system repairs.

Specifications and technical data

• SKU: 7581848-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7581848
• Substitutable numbers: 7581848, 12147581848, 7591162, 12147591162, 7591163, 12147591163, 7567321, 12147567321, 7585435, 12147585435, 7585249, 12147585249, 7582242, 12147582242, 7581610, 12147581610, 7557951, 12147557951, 7581609, 12147581609, 6943834, 61356943834
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and compatibility

The kit has been prepared for BMW 1 Series E81/E87 LCI and 3 Series E90 models in 116i and 316i versions with the N45N petrol engine. The presence of the CAS3 module along with the keys ensures the integrity of the vehicle's security system and facilitates integration with the existing electrical installation. Thanks to its compatibility with manual transmissions, the entire system works in harmony with the factory powertrain control logic.

Function of the ECU DME CAS3 + Keys kit

In this set, the DME controller is responsible for precise management of the engine's operation – including fuel delivery, ignition, and communication with other vehicle modules. The CAS3 module acts as the central component of the immobilizer and start authorization system, communicating with both the DME and the keys. The inclusion of matched keys minimizes the risk of synchronization issues and allows for the efficient restoration of vehicle functionality following an electronic failure.

Benefits of using a complete kit

Using a complete ECU kit with CAS3 and keys is particularly advantageous in cases of severe electronic damage, where replacing a single module would require time-consuming programming. Here, you receive a pre-matched set that can significantly simplify the repair process. This solution helps reduce diagnostic and programming costs while maintaining the integrity of the security and engine control systems.

Practical service application

This set is suitable for both professional workshops specializing in the BMW brand and advanced users performing their own vehicle maintenance. It can be used for:

• replacing a damaged engine control unit in 116i/316i petrol versions,
• repairs following water damage or electrical surges,
• immobilizer and key authorization issues where multiple components need to be replaced simultaneously.

Because all key components are included in one set, it is easier to maintain compatibility between the controller, the security module, and the keys, which translates into a more predictable vehicle startup process after the repair.

BMW electronic control modules and controllers

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

Technical support and knowledge about BMW electronics

To better plan your repair and understand how the engine controller interacts with other modules in the 3 and 5 Series, it is worth consulting practical tips on diagnostics and selecting used parts. A detailed discussion of issues related to the iDrive system, FRM modules, and engine controllers can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models using salvaged parts?, which will help you better utilize the potential of the offered kit in service practice.