BMW E87 E90 E91 118d 318d M47N2 122HP Engine ECU KIT DDE 7803372 CAS3 + Key

BMW E87 E90 E91 118d 318d M47N2 122HP Engine ECU KIT DDE CAS3 + Key is a complete engine control set designed for selected BMW 1 and 3 Series models with the M47N2 unit. The set includes a DDE controller, a CAS3 module, and a matched key, which facilitates professional replacement of the control system without the need for time-consuming programming from scratch. This solution is particularly useful in the event of a factory controller failure or issues with the immobilizer.

Specifications and technical data

• SKU: 7803372-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7803372
• Substitutable numbers: 13617808124, 7808124, 13617803372, 7803372, 13617801710, 7801710, 13617799854, 7799854, 13617798179, 7798179, 13617797496, 7797496, 13617797216, 7797216, 13617795844, 7795844, Control Unit, 0281013502, 0 281 013 502, 61356943830, 6943830
• Category: ECUs & Computer Modules

Application and function of the DDE CAS3 + key ECU kit

The presented set is part of the Electronic control modules and controllers group, responsible for managing the operation of the 122 HP M47N2 diesel engine in BMW E87, E90, and E91 models in 118d and 318d versions. Combining the DDE controller with the CAS3 module and a matched key ensures a coherent start authorization system, which minimizes the risk of conflicts with the immobilizer and communication errors in the vehicle's bus.

A set configured in this way allows for efficient replacement of a damaged engine controller in situations where standard electronics repair is unprofitable or technically difficult. The set is particularly useful in workshops specializing in BMW electronics, where repeatability of results and reducing vehicle downtime are key.

Benefits of using the complete DDE + CAS3 + key set

Choosing a complete engine controller set with a CAS3 module and key offers a number of practical advantages:

• consistency of components responsible for vehicle starting and authorization,
• reduction in the scope of coding and adaptation compared to replacing individual modules,
• possibility of restoring proper engine operation after an electronic control failure,
• easier diagnostics in case of previous communication problems between the controller and the CAS module.

For the user, this means a more predictable repair process and a higher chance of stable powertrain operation after replacement. For the workshop, it is an opportunity to offer the customer a solution based on original BMW components, which positively affects durability and compatibility.

Product characteristics and condition

The offered set comes from disassembly and is marked as a used BMW component, which is an attractive cost-effective alternative to new controllers. These types of components are often chosen for repairs of daily-driven cars, where a reasonable balance between price and functionality is crucial.

Due to the specific nature of automotive electronics, installation by a workshop with experience in BMW DDE and CAS3 systems is recommended, which will allow for the proper execution of necessary adaptation procedures and final diagnostics.

Technical support and knowledge about BMW electronics

If you want to better understand how to take care of your BMW engine controller, comfort modules, or iDrive system in the 3 and 5 Series, it is worth checking out specialized materials. Practical tips on using parts from disassembly, including engine controllers and FRM modules, can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 Series models, which will help you plan electronics repairs consciously.

Related BMW control modules

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