BMW E90 E91 N43 320i 170HP Engine ECU DME Kit CAS3 + Key 7578032 Manual

BMW E90 E91 N43 320i 170HP Engine ECU DME Kit CAS3 + Key is a complete engine control set designed for N43 petrol units in 3 Series models with a manual transmission. The kit includes the DME engine controller along with the CAS3 module and a matched key, which facilitates the restoration of proper powertrain operation after an electronic failure. This solution allows for consistent matching of control elements within a single vehicle, reducing diagnostic and configuration time.

Specifications and technical data

• SKU: 7578032-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7578032
• Substitutable numbers: 7578032, 5WK93633, 6943834, 61356943834
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU DME CAS3 kit

The presented kit belongs to the Electronic control modules and controllers group and is dedicated to the 170 HP N43 petrol engine in the 3 Series E90/E91 with a manual transmission. Combining the DME controller with the CAS3 module and key ensures the consistency of the immobilizer system, which is crucial when replacing engine electronics in modern BMW vehicles.

In practice, such a set enables:

• restoring communication between the engine controller and the CAS3 module,
• maintaining compatibility with the vehicle's security system,
• reducing the need for advanced programming compared to replacing individual components.

Benefits of using a complete DME + CAS3 + key kit

Using a complete control kit with a matched key is particularly beneficial in the event of major electronic faults. Component consistency minimizes the risk of starting issues, immobilizer errors, or lack of communication on the data bus. For workshops, this means shorter installation time and fewer potential points of conflict during adaptation.

In the case of N43 petrol units with a manual transmission, it is important that the engine controller is compatible with both the fuel type and the transmission configuration. This kit has been prepared specifically for such a configuration, which facilitates selection for a specific vehicle specification.

Application in BMW 3 Series vehicles

BMW E90 and E91 with the N43 320i engine use advanced control electronics that integrate engine management with safety and comfort systems. Replacing the DME controller without a properly matched CAS3 module and key can lead to the need for time-consuming configuration. Using a complete kit often simplifies the process of restoring vehicle functionality after the original electronics have been damaged.

The product is intended for vehicles with a petrol engine and a manual transmission, which is important when selecting control maps, clutch operation logic, and cooperation with other modules in the vehicle.

Product characteristics and condition

The kit comes from the BMW range and is part of the vehicle's original electronic architecture. As a used part, it has been sourced from dismantling and is intended for reinstallation after prior verification of compatibility with a specific vehicle. This type of solution is often chosen as an economical alternative to new controllers, while maintaining the manufacturer's original specification.

Before installation, a standard diagnostic procedure and consultation with an automotive electrician are recommended to confirm the correct selection of the kit for the given VIN and equipment configuration.

Selection support and additional information

The selection of the appropriate engine controller, CAS3 module, and key kit should be based on the OEM number and vehicle data. Practical tips on purchasing used electronics, including engine controllers, can be found in the article: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. This is a helpful source of knowledge when planning the repair of electronic systems in a BMW.

If you want to delve deeper into the topic of selecting parts by OEM number or VIN, the following guide may be useful: how to choose the right car part by VIN and OEM number, which describes the compatibility verification process step by step.

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