BMW E87 LCI E90 118d 318d N47 Diesel ECU KIT DDE 7811701 CAS3 2 Keys Manual

BMW E87 LCI E90 118d 318d N47 Diesel ECU KIT DDE CAS3 2 Keys Manual is a complete engine control set designed for selected BMW models with the N47 engine and manual transmission. The set includes the DDE engine control unit, the CAS3 module, and two keys, allowing for a coherent match of the powertrain electronics and the immobilizer. This is a practical solution for workshops and users performing replacement or adaptation of the control system in diesel vehicles.

Specifications and technical data

• SKU: 7811701-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811701
• Substitutable numbers: 13617807828, 7807828, 61356943834, 6943834, 13618506281, 13617812501136178100011361781170113617807143, 7812501781000178117017807143, 13617807204136178120011361780900113617807529, 7807204781200178090017807529, 136185087121361780840313617806700, 8508712
• Fuel type: Diesel
• Gearbox type: Manual
• Category: Control Modules

Purpose and function of the ECU kit

The presented set from the Computers and controllers category has been designed to work with the N47 diesel engine in BMW 1 Series E87 LCI and 3 Series E90 models in 118d and 318d versions. The set includes the DDE controller responsible for precise management of the engine's operation, the CAS3 module handling start authorization, and two keys matched to this set.

Such a combination of components allows for maintaining the consistency of the security and control system, which is particularly important when replacing electronics in vehicles with a diesel engine and manual transmission. This minimizes the need for additional programming, depending on the procedures used in a given workshop.

Benefits of using a complete DDE + CAS3 + keys set

Using a complete control set brings a number of practical benefits in the process of repairing or upgrading the powertrain:

• consistency of the engine controller and the CAS3 module in one set,
• two matched keys enabling convenient vehicle operation after installation,
• reduction of the risk of conflicts between the immobilizer and the engine controller,
• facilitation of service work when adapting electronics in BMW diesel vehicles.

For workshops specializing in the BMW brand, such a set provides a convenient base for further configuration, allowing them to focus on correct installation and diagnostics instead of sourcing individual modules.

Technical characteristics in the context of the powertrain

The set has been prepared for vehicles with a diesel engine, where the DDE controller is responsible for precise fuel dosing, boost control, fuel injection system operation, and cooperation with other vehicle modules. The version intended for cars with a manual transmission takes into account the specifics of working with a mechanical drivetrain, which is important when configuring functions such as torque control or load response.

Combining these elements into one set facilitates maintaining proper communication within the vehicle network, which is crucial for stable engine operation, correct starting, and the proper functioning of safety and comfort systems.

Application in service practice

The complete ECU set with the CAS3 module and keys is particularly useful in situations such as replacing a damaged controller, repairing after electronics flooding, or rebuilding the vehicle's powertrain. The used nature of the set allows for an economical approach to repair while maintaining the original BMW electronic architecture.

Before installation, it is recommended to verify compatibility with the specific vehicle equipment version and perform full diagnostics after installation to confirm proper communication of all modules. A professional service approach will allow you to fully utilize the potential of this set in daily operation.

If you are planning a comprehensive repair or upgrade of the engine electronics in your BMW and need other components from the same group, such as engine controllers, control modules, or ECU sets with an immobilizer, check the available parts in the BMW Computers and controllers category.

To better assess when choosing a used ECU set, comfort module, or other electronic components makes sense, it is worth reading our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?