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 a professional solution for 120i and 320i models after the facelift, equipped with a manual transmission. The set belongs to the Electronic control modules and controllers category and is designed for BMW E87 LCI and E90 series vehicles, ensuring the consistency of the powertrain electronics and the immobilizer system.

Specifications and technical data

• SKU: 7599881-10
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7599881
• Substitutable numbers: 12147640015, 7640015, 12147621178, 7621178, 12147599881, 7599881, 5WK93729, 61359237047, 9237047, KZ
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Intended use and kit configuration

The presented BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU KIT DME CAS3 Key Manual is dedicated to BMW 1 Series E87 LCI and 3 Series E90 cars with the N43 petrol engine producing 170 HP. It has been prepared for vehicles with a manual transmission, which facilitates selection based on the specific drivetrain configuration and minimizes the risk of compatibility issues.

Combining the engine control unit with the CAS3 module and the key in one set allows for maintaining the integrity of the security system, which is particularly important when replacing electronics in modern petrol units. As a result, the workshop or user receives a foundation for efficient adaptation of the set to replace a damaged system.

Benefits of using the complete BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU KIT DME CAS3 Key Manual

Using a complete control set in a BMW with an N43 engine brings a number of practical benefits:

• maintaining compatibility between the engine control unit and the CAS3 module responsible for start authorization,
• the presence of a matched key, which facilitates the vehicle starting process after installation,
• reducing the need for deep immobilizer programming on the workshop side,
• consistency of electronics within the powertrain for the petrol unit.

For vehicles with an N43 engine, it is important that the engine control unit is selected not only based on the fuel type but also the transmission configuration. This set is prepared specifically for the manual transmission variant, which provides clear assistance in part selection and repair planning.

Application in workshop practice

Replacing a damaged engine control unit in a BMW E87 LCI or E90 often involves the need to interfere with the vehicle's security system. The BMW E87 LCI E90 120i 320i Petrol N43 170HP ECU KIT DME CAS3 Key Manual allows for an organized approach to the repair – all key electronic components responsible for starting and operating the petrol unit are gathered in one set. This solution is particularly valued in workshops specializing in the BMW brand, where the repeatability of procedures and a predictable final result are what count.

The used condition means that the components come from dismantling, which in practice allows for an economical repair while maintaining the vehicle's original electronic architecture. For many users and services, this is a reasonable compromise between cost and functionality, especially in the case of older 1 and 3 series generations.

Selection by numbers and technical support

Before purchasing, it is worth verifying the compatibility of the set with a specific BMW unit using the OEM number and available interchangeable numbers in the technical specifications section. This allows for confirming compatibility with the given N43 engine version and equipment configuration. In case of doubt, matching by VIN number is also helpful, which makes it easier to avoid mistakes when ordering.

If you want to better understand how to safely use used electronics in a car, how to check hardware and software compatibility, and what to pay attention to during installation, read the guide: Used automotive electronics – second-hand ECU modules and sensors. This is a practical source of knowledge for mechanics and informed users.

Expanding repairs within BMW electronics

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

For workshops that want to shorten vehicle downtime in the service, material describing the impact of the availability of used OEM parts on repair speed may also be useful: how the availability of used modules and controllers affects repair time in the workshop. Thanks to this, it is easier to plan service logistics and choose an electronics replacement strategy in BMW vehicles.