BMW 3 Series E90 E91 E92 N52N 325i 218HP ECU Kit DME CAS3 + Key 7574544 Manual

BMW 3 Series E90 E91 E92 N52N 325i 218HP ECU Kit DME CAS3 + Key Manual is a complete electronic set designed for engine and immobilizer system control in BMW 3 Series models with the N52N 325i unit and manual transmission. The set includes the DME engine control unit, the CAS3 module, and a matched key, which facilitates the restoration of proper powertrain electronics operation after a failure or engine replacement. This solution allows for consistent matching of control components in a single, compatible package.

Specifications and technical data

• SKU: 7574544-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7574544
• Substitutable numbers: 12147574544, 7574544, 12147581123, 7581123, 12148613000, 8613000, 61356943830, 6943830, 5WK90210
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the BMW 3 Series E90 E91 E92 N52N 325i 218HP ECU Kit DME CAS3 + Key Manual

The control set is dedicated to BMW 3 Series E90, E91, and E92 generation vehicles with the N52N 325i engine and manual transmission. The combination of the DME controller, CAS3 module, and key ensures consistent operation of the starting system, security features, and engine management. This makes it possible to restore the original engine control logic, which promotes stable operation, proper starting, and the maintenance of factory performance parameters.

Benefits of using a complete control unit set

Using a complete ECU set with the CAS3 module and key reduces the risk of issues with matching individual electronic components. In one package, you receive:

• a consistent engine and immobilizer control set,
• maintained compatibility between the DME, CAS3, and key,
• simplified configuration during installation and programming,
• a reduction in potential communication errors within the vehicle's bus.

For workshops and automotive electronics specialists, this means faster diagnostics, easier installation, and a lower risk of needing additional modifications. The complete ECU set is particularly useful when replacing a damaged controller, performing an engine swap, or restoring a car after a major electrical system failure.

Technical characteristics and compatibility

The presented set belongs to the Electronic control modules and controllers group, meaning it is responsible for key processes related to engine operation, start authorization, and communication with other vehicle systems. The set is designed for use with a manual transmission, which is important when selecting the appropriate software and control maps. This allows for the maintenance of the correct engine operating characteristics, tailored to the specific drivetrain configuration.

Its original BMW origin promotes high compatibility with the vehicle's factory installation, as well as correct cooperation with other modules in the CAN network. For the end user, this translates into predictable car behavior, the absence of unwanted error messages, and stable operation of onboard systems.

Condition, service application, and selection of used electronics

The set comes from the used parts group, making it an attractive cost-effective solution while maintaining the manufacturer's original specifications. This type of ECU DME CAS3 + Key set is often chosen for:

• repairs after engine controller damage,
• problems with the immobilizer and key authorization,
• restoring configuration after engine or wiring harness replacement,
• renovation projects and vehicle rebuilding.

If you want to better understand when choosing a used engine controller or comfort module is justified, it is worth reading the guide: Second life for electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?. You will find practical tips there regarding the selection and verification of used automotive electronics.

Additionally, if you are considering the difference between a used original part and a replacement, the article 5 reasons why a used OEM part is a better choice than a replacement, which discusses specific service scenarios and selection criteria, may be helpful.

Expanding BMW electronics repair

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

By choosing original BMW control modules, you increase the chance of seamless integration with the existing installation, which is particularly important in modern vehicles where many systems are closely linked. As a result, the repair or upgrade can proceed more efficiently, and the vehicle retains parameters close to factory standards.