BMW E81 E87 LCI E90 N43 118i 318i ECU Kit DME 7621178 CAS3 Keys Manual

BMW E81 E87 LCI E90 N43 118i 318i ECU Kit DME CAS3 Keys Manual is a complete engine control kit designed for selected BMW models with the N43 engine and manual transmission. The set includes the DME controller, CAS3 module, and matched keys, which facilitates restoring the proper operation of the electronic system after a failure or engine replacement. This solution allows for a consistent match of powertrain electronics in a single package.

Specifications and technical data

• SKU: 7621178-3
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7621178
• Substitutable numbers: 12147640015, 7640015, 12147621178, 7621178, 61359237047, 9237047, 5WK94901
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Application of the ECU DME CAS3 kit with keys

The presented kit is dedicated to BMW 1 Series E81/E87 LCI and BMW 3 Series E90 vehicles with the N43 engine in 118i and 318i versions. The ECU DME kit with the CAS3 module and keys allows for a consistent replacement of the entire engine control and immobilizer system, which is particularly important in cases of vehicle starting problems, communication errors between modules, or after replacing the power unit.

Since all components come from a single vehicle, software and coding compatibility is maintained, which limits the need for extensive adaptation in the vehicle.

Electronic control modules and controllers – technical characteristics

The kit belongs to the Electronic control modules and controllers group, responsible for precise management of engine operation and vehicle security. The DME controller manages, among other things, fuel dosage, ignition, and accessory operation, while the CAS3 module is responsible for key authorization and start/stop function handling. Combining these elements in one package minimizes the risk of software conflicts and speeds up the installation process.

The presence of matched keys allows for maintaining the integrity of the immobilizer system, which is crucial when replacing electronics in modern BMW vehicles.

Compatibility with manual transmission

The kit is configured for a manual transmission, which is significant for the proper cooperation of the engine controller with other vehicle modules. The appropriate DME software for a manual gearbox ensures correct engine operating maps, torque control logic, and communication with other vehicle systems.

Selecting an ECU kit for a specific transmission type limits the need for software modifications and reduces the risk of diagnostic errors after installation.

Condition, origin, and advantages of purchasing a used kit

The product comes from dismantling and is offered as a used ECU kit with CAS3 module and keys. This type of solution is often chosen for economic repairs when the cost of new electronic components is disproportionately high relative to the vehicle's value. A complete package from one car facilitates the work of an electrician or diagnostician, shortening the time required for configuration.

Purchasing a ready-made engine controller, CAS3 module, and key set allows for reducing the number of variables in the repair process – instead of programming each element separately, the mechanic works on an already synchronized set.

Support in selection and expanding knowledge

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

For a better understanding of how original electronic modules influence the character and handling of a premium class car, it is worth reading the article on our blog: Audi and emotions in their purest form – how used modules and controllers help maintain the brand's DNA.