BMW E90 E91 E92 N52N 325i 218HP ECU Kit DME CAS3 Key 7574544 Automatic

BMW E90 E91 E92 N52N 325i 218HP ECU Kit DME CAS3 Key is an original electronic control module from the Electronic control modules and controllers group, designed to work with the N52N petrol engine in 3 Series models. This solution is created for drivers who expect stable engine performance, proper communication with other vehicle systems, and the preservation of factory operating parameters for the 325i 218 HP version.

Specifications and technical data

• SKU: 7574544-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7574544
• Substitutable numbers: 12147574544, 7574544, 12147581123, 7581123, 12148613000, 8613000, 61356943830, 6943830, 5WK90210
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the controller

The presented computer is the central element managing the engine operation in BMW 3 Series E90, E91, and E92 generations with the N52N unit in the 325i version. It is responsible for precise control of fuel injection, ignition, auxiliary equipment operation, and communication with other vehicle modules, which translates into smooth power delivery of 218 HP, predictable throttle response, and stable operation across the entire rev range.

By using an original controller, the consistency of the vehicle's software and electrical architecture is maintained, which facilitates diagnostics, coding, and subsequent servicing in specialized BMW workshops.

Compatibility with automatic transmission

This computer is designed for vehicles equipped with an automatic transmission. This means that the engine control logic is adapted to work with an automatic gearbox, taking into account, among other things, gear shift strategy, load moments, and driving modes.

In practice, a correctly selected controller for an automatic version translates into:

• smoother gear shifting under various loads,
• better coordination of engine torque with gearbox operation,
• stable vehicle behavior in comfort and dynamic modes.

Application in BMW service and diagnostics

Replacing the engine computer in BMW E90, E91, and E92 with the N52N unit is often necessary in case of electronics damage, bus communication problems, or errors that cannot be cleared by standard programming procedures. Using an original module from the same family allows for:

• maintaining the factory control logic of the 325i engine,
• easier matching to the existing electrical installation,
• correct coding and adaptation based on the specific vehicle's equipment.

For workshops specializing in the BMW brand, this is a practical solution that reduces repair time and limits the risk of software compatibility issues.

Benefits of using an original module

Choosing an original engine computer for a BMW 3 Series with an N52N 325i engine ensures consistency with the vehicle's factory architecture. This is particularly important in cars where many systems – from the transmission and safety systems to comfort features – communicate with the engine control module.

Key advantages include:

• maintaining factory engine operating parameters without the need for wiring or software modifications,
• easier integration with existing electronic modules in the vehicle,
• the ability to use standard BMW service procedures for coding and adaptation.

BMW electronic control modules – expansion and modernization

If you are planning a comprehensive repair or modernization of the control electronics in your BMW and need other components from the same group, such as comfort modules, light controllers, or engine management units, check out the available parts in the BMW electronic control modules and controllers category.

More knowledge about BMW electronic modules

When working with engine computers, FRM modules, or the iDrive system, it is worth knowing the best practices for installation, coding, and selecting used parts. Practical tips regarding the 3 and 5 Series 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 used parts?, which helps in consciously planning electronics repairs in BMWs.