BMW E60 E90 E91 LCI 325i 525i N53 218HP ECU Kit DME 7616431 CAS3 + Key Automatic

BMW E60 E90 E91 LCI 325i 525i N53 218HP ECU Kit DME CAS3 + Key Automatic is a complete engine control and immobilizer kit designed for selected BMW models with the N53 engine, 218 HP output, and automatic transmission. The set includes the DME controller, CAS3 module, and a matched key, which facilitates restoring the proper operation of the electronic system after a failure or engine replacement. This solution allows for consistent matching of powertrain electronics in E-generation 3 and 5 series cars.

Specifications and technical data

• SKU: 7616431-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7616431
• Substitutable numbers: 12147616431, 7616431, 5WK93754, 61359147220, 9147220
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Application and compatibility with the N53 unit

The ECU DME kit with the CAS3 module and key is intended for BMW E60, E90, and E91 LCI vehicles equipped with the 218 HP N53 petrol engine and automatic transmission. Combining the engine controller with a matched CAS3 module and key ensures the integrity of the security system, which is crucial when replacing electronics in modern power units. This effectively resolves issues with engine starting, immobilizer errors, or incorrect communication between controllers.

Function of the DME controller and CAS3 module

The DME controller included in the kit is responsible for precise management of the N53 engine – from fuel dosing and ignition to cooperation with the automatic transmission. The CAS3 module acts as the central element of the vehicle's access and starting system, communicating with both the key and the DME. The set with a pre-paired key allows for maintaining the integrity of the security system without the need for tedious matching of individual components.

Benefits of using a complete ECU kit

Choosing a complete ECU DME + CAS3 + key kit brings a number of practical benefits to the repair process:

• consistency of powertrain electronics and the immobilizer system within a single vehicle,
• reduced risk of synchronization problems between the engine controller and the CAS module,
• easier workshop operations when replacing electronics in cars with automatic transmissions,
• the ability to restore proper starting and operation of the N53 unit after the original controller fails.

For BMW cars of this generation, where engine electronics are closely linked to the security system, using such a kit significantly simplifies the diagnostic and installation process.

Professional selection by OEM and reference numbers

The selection of the appropriate ECU kit for a specific BMW configuration should always be based on verifying OEM and replacement numbers in the vehicle documentation and service software. This helps avoid compatibility issues, especially in the case of different equipment versions and controller software. If you want to learn more about the safe selection of electronics and other components by number, you will find practical tips in the article how to safely buy parts online by verifying them with OEM numbers.

Electronic control modules and BMW controllers – expansion and modernization

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

Support in maintaining the premium brand character

Precisely selected controllers and electronic modules have a direct impact on engine performance, throttle response, and the driving culture typical of premium brands. Although the described kit is intended for BMW, issues related to maintaining the factory character of the car using original components are common to many manufacturers. You can read more about how properly selected modules and equipment elements influence the preservation of a premium car's DNA in the article on the role of original parts in maintaining the character of Audi.

Summary

BMW E60 E90 E91 LCI 325i 525i N53 218HP ECU Kit DME CAS3 + Key Automatic is a practical solution for users and workshops that need a complete, tuned engine electronics and immobilizer set for cars with the N53 unit and automatic transmission. The kit facilitates restoring the proper operation of the powertrain, reduces the risk of controller synchronization problems, and allows for maintaining the correct operating parameters characteristic of BMW cars of this generation.