BMW E81 E87 LCI E90 N43 118i 318i ECU Kit DME CAS3 Lock 7621178 + Key Manual

BMW E81 E87 LCI E90 N43 118i 318i ECU Kit DME CAS3 Lock 7621178 + Key Manual is a complete engine control and immobiliser kit designed for petrol BMW models with a manual gearbox. The kit includes the DME module, the CAS3 module with lock, and a matching key, facilitating the restoration of correct powertrain electronics operation after a failure or control unit replacement. By maintaining the consistency of the security system components, it allows for efficient and technically correct adaptation within the vehicle.

Specifications and technical data

• SKU: 7621178-8
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7621178
• Substitutable numbers: 12147640015, 7640015, 12147621178, 7621178, 5WK94901, 61359237047, 9237047
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and Function of the ECU DME CAS3 Kit

The presented kit is part of the Electronic Control Modules and Controllers category and is designed to work with the N43 petrol engine in BMW 1 Series (E81, E87 LCI) and 3 Series (E90) models, specifically the 118i and 318i versions. The combination of the DME engine controller with the CAS3 module and key ensures immobiliser data consistency, which is crucial when replacing powertrain electronics in modern vehicles.

The system is adapted for use with a manual gearbox, which is important when selecting the appropriate controller for a specific vehicle configuration. The use of an original BMW solution allows for the preservation of the factory control logic and communication within the vehicle network.

Benefits of Using a Complete DME + CAS3 + Key Kit

Using a complete ECU kit with the CAS3 module and key offers a range of practical benefits during the repair process:

• maintaining compatibility between the engine controller and the immobiliser system,
• reducing the need for extensive programming and matching of multiple modules,
• simplifying diagnostics and vehicle startup after replacing a faulty controller,
• ensuring consistency with BMW's original electronic architecture.

This makes the kit particularly useful for more complex engine control system repairs where simultaneous adaptation of several electronic components is required. The completeness of the kit helps reduce workshop time and minimise the risk of issues with key authorisation and starting.

Technical Characteristics in the Context of the Powertrain

The kit is prepared for use with a petrol engine, which is significant for injection maps, ignition, and engine unit operating strategies. The DME controller in this configuration supports specific algorithms for the N43 engine, tailored to the characteristics of a four-cylinder petrol unit.

Adaptation for a manual gearbox means that the control logic takes into account cooperation with the mechanical drivetrain, including appropriate idle strategies, response to load changes, and communication with other vehicle modules. For workshops, this means the kit can be used in specific drivetrain configurations without the need to modify software for other transmission types.

Condition, Origin, and Service Application

The product comes from the BMW brand and is part of the original electronic architecture used in the manufacturer's vehicles. As a used part, it represents an attractive solution for workshops and users looking to restore the engine control system's functionality while maintaining reasonable repair costs.

The ECU DME CAS3 kit with key is suitable for both replacing a damaged controller and for more complex powertrain electronics work where maintaining consistency between modules responsible for vehicle startup and security is essential. Proper selection for the specific model and configuration is key to the correct operation of the entire system.

Expanding Control Systems and Technical Knowledge

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as additional controllers, comfort modules, or powertrain management units, check the available parts in the BMW Electronic Control Modules and Controllers category.

When selecting used electronic components, it is worth considering the differences between refurbished parts and original dismantled components. If you want to better understand when it is beneficial to use a used control module or other component, an article on our blog may be helpful: Refurbished or Used Original – Which Part to Choose for a Repair?.

To compare how premium manufacturers approach maintaining vehicle character, you can also read the text dedicated to the Audi brand and the role of original components in preserving driving characteristics and equipment: Audi and Pure Emotion. How Used Parts Help Maintain the Brand's DNA?.