BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU KIT DME 7599881 CAS3 Key Manual

BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU KIT DME CAS3 Key Manual is an original electronic control module designed for the N43 petrol engine in the 3 Series model with a manual transmission. The kit includes the engine control unit and a matched key, which facilitates restoring proper powertrain operation after a failure or engine replacement. This solution allows for an efficient, technically correct repair without the need to search for multiple separate components.

Specifications and technical data

• SKU: 7599881-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7599881
• Substitutable numbers: 12147640015, 7640015, 12147621178, 7621178, 12147599881, 7599881, 5WK93729, 61359217853, 9217853, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the control unit

The control unit from the BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU KIT DME CAS3 Key Manual set is responsible for precise management of the petrol engine's operation, including fuel injection, ignition, and communication with other vehicle electronic modules. The module's design is tailored to the specifics of the N43 unit and the manual transmission configuration, ensuring proper communication with the vehicle's wiring and stable powertrain performance.

The inclusion of the key in the set simplifies the adaptation process in the vehicle, as the control unit and transponder are already linked. For workshops specializing in BMW electronics, this means faster diagnostics and configuration, and for the user, it reduces the risk of immobilizer issues after module replacement.

Benefits of using an original BMW module

As an item from the Electronic control modules and controllers group, this control unit ensures compatibility with the factory electrical architecture of the BMW 3 Series. The original design translates into:

• proper cooperation with the vehicle's wiring and other control units,
• maintenance of factory petrol engine operating parameters,
• easier diagnostics using dedicated BMW service tools,
• the possibility of professional repair without interfering with wiring harnesses or additional modifications.

For users looking for a service solution with predictable behavior, using an original module is particularly beneficial when dealing with starting problems, unstable idle, or communication errors in the vehicle network.

Application in a powertrain with a manual transmission

The control unit has been prepared for use with a manual transmission, which is important for torque management logic, throttle response, and cooperation with safety systems. Proper matching of the module to the transmission type reduces the risk of communication errors with other control units and ensures consistent operation of driver assistance systems.

Being dedicated to the N43 petrol engine means that the control maps and operating algorithms are adjusted to the characteristics of this unit, which helps maintain proper engine refinement, fuel consumption, and dynamics while adhering to the manufacturer's factory specifications.

Condition, verification, and use in repairs

The module is a salvaged part intended for reinstallation in a vehicle after proper configuration at a specialized service center. Such components are frequently used in professional repairs when it is necessary to replace a damaged control unit while keeping service costs reasonable. The kit with the key provides a practical solution for workshops dealing with BMW electronics, enabling efficient restoration of vehicle functionality after an engine control system failure.

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

More about BMW electronics repairs

If you want to better understand how to properly approach the repair of an engine control unit, iDrive modules, or FRM in the 3 and 5 Series, it is worth checking out practical tips on using salvaged parts. You can find a detailed discussion in the article: Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models.