BMW 1 3 E87 E90 N45 116i 316i Petrol ECU Kit DME 7557809 + CAS 3 + Key Manual

BMW 1 3 E87 E90 N45 116i 316i Petrol ECU Kit DME + CAS 3 + Key Manual is a complete engine control kit designed for selected BMW 1 and 3 Series models with the N45 engine and manual transmission. The kit includes the DME module, CAS 3 module, and a matched key, which facilitates restoring reliable starting and proper operation of the powertrain. This solution is particularly useful when replacing a faulty ECU or performing advanced engine electronics repairs.

Specifications and technical data

• SKU: 7557809-8
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7557809
• Substitutable numbers: 12147557809, 7557809, 12142461574, 2461574, 0261209085, 61356943830, 6943830, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME + CAS 3 + key kit

The presented kit is configured for the N45 petrol engine in BMW 116i and 316i models with a manual transmission. Combining the DME controller with the CAS 3 module and the key ensures consistency of the immobilizer system, starting sequence, and engine management. This allows for the restoration of full functionality of the electronic system responsible for ignition, fuel injection, and communication with other vehicle systems.

Benefits of using a complete control unit kit

Using a complete ECU kit with the CAS 3 module and key significantly simplifies the repair process compared to replacing individual components. It eliminates the need for time-consuming matching of individual parts and the risk of incompatibility between the engine controller and the security system. For workshops and users, this means:

• a consistent engine control and immobilizer system,
• easier configuration during installation,
• fewer starting issues after replacing electronics,
• more predictable repair turnaround time.

Application in BMW vehicles with petrol engines and manual transmissions

The kit is dedicated to BMW 1 Series E87 and 3 Series E90 cars with a petrol engine and manual gearbox. Such matching for a specific fuel type and transmission ensures the preservation of correct engine maps and proper cooperation with other vehicle modules. In practice, this translates into stable engine operation, correct throttle response, and predictable vehicle behavior in daily use.

Characteristics of the used product

The offered kit comes from dismantling and is a used item, which provides a cost-effective solution while maintaining the manufacturer's original specifications. Choosing this solution is particularly attractive for repairs of older BMW models, where a reasonable budget is important while maintaining compatibility with factory electronics. A used DME + CAS 3 + key set allows for effectively restoring vehicle performance without the need to invest in new, significantly more expensive controllers.

BMW electronic control modules and controllers – expansion and service

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, 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 E90 units

When working with engine electronics in BMW 3 Series models, it is worth knowing the typical problems of these power units to better plan the scope of repairs. Practical information on critical areas and potential service costs can be found in the article Faulty BMW E90 engines: check what can ruin your budget, which helps in taking an informed approach to diagnostics and selecting components such as ECU kits.

For a comparison of how other manufacturers approach maintaining their brand character and the role of original control modules, you can also read the blog post Audi and pure emotion. How do used parts help maintain the brand's DNA?, which shows how important it is to use properly selected electronic components in premium class cars.