BMW E90 E91 LCI E92 330d Diesel N57 245HP ECU Engine Kit DDE 7823973 CAS3 + Key

The DDE Engine Control Unit set with CAS3 module and key for BMW 3 Series with a diesel engine is a practical solution for workshops and users who need a functional engine electronics set after an engine replacement or electrical system repair. The set is designed for BMW models from the E90, E91 LCI, and E92 330d family with a Diesel engine, ensuring seamless communication between the control unit, immobilizer module, and key.

Specifications and technical data

• SKU: 7823973-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7823973
• Substitutable numbers: 13618510221, 8510221, 13618506086, 8506086, 13618506377, 8506377, 13617823973, 7823973, 13617823513, 7823513, 13618506444, 8506444, 13618507136, 8507136, 0281014726, 0 281 014 726, 61359147226, 9147226, KZ
• Fuel type: Diesel
• Category: ECUs & Computer Modules

Purpose and Compatibility

The presented DDE Engine ECU set with CAS3 and key is dedicated to BMW 3 Series E90, E91 LCI, and E92 models in the 330d version with a diesel engine. Using a complete set from a single vehicle ensures compatibility between the engine control unit, security module, and the key's transponder, significantly simplifying vehicle startup after repairs.

The electronics prepared for operation with a Diesel engine ensure proper handling of injection parameters, boost, and engine protection, which is crucial for maintaining the factory operating characteristics of the BMW 330d engine.

Function of the DDE + CAS3 + Key Set

The set includes a DDE engine control unit, a CAS3 module responsible for start authorization, and a matching key. This configuration creates a cohesive security and control system that:

• ensures correct engine start authorization,
• minimizes the risk of conflicts between the control unit and the immobilizer,
• simplifies diagnostics and adaptation compared to selecting individual components from different vehicles.

For workshops specializing in BMW, this provides a convenient base for further vehicle configuration after an engine replacement, electrical system installation, or in cases of post-accident repairs.

Condition, Origin, and Benefits of Using a Used Set

The product comes from a dismantled BMW vehicle and is offered as a used engine electronics set. Choosing this solution allows you to:

• reduce repair costs compared to new parts,
• maintain the original engine control architecture,
• shorten the time to restore full vehicle functionality thanks to a ready-made set.

With proper installation and configuration, a used ECU set with CAS3 and key can effectively work with the vehicle's existing system, serving as a solid foundation for further diagnostics and tuning within manufacturer-specified limits.

BMW Electronic Control Modules and Units – Expansion and Service

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

To deepen your knowledge of engine control unit operation, comfort modules, and the iDrive system in the 3 and 5 Series, as well as the use of dismantled parts in professional repairs, it is worth reading the article Driving Pleasure for Years – How to Care for iDrive Systems and Electronic Modules in BMW 3 and 5 Series Models. If you want to better understand the specifics of the used parts market and dispel doubts about their quality, the post Used Car Parts: Myths and Facts You Need to Know will also be helpful.