BMW 1 Series E87 ECU Key Reading Module Control Unit CAS 2 61356943759 6943759

The CAS 2 control module for BMW 1 Series E87 is an original electronic unit responsible for key recognition system operation and start authorization. It is a factory BMW component that ensures correct integration with the vehicle's electrical system and other control units, contributing to stable operation of comfort and security systems.

Specifications and technical data

• SKU: 6943759
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6943759
• Substitutable numbers: 61356943759, 6943759, 61356943767, 6943767, 61356943756, 61356943757, 61356943753, 61356943750, 6943756, 6943757, 6943753, 6943750, 61356943747, 61356943760, 61356943751, 6943747, 6943760, 6943751, BG

Purpose and Function of the CAS 2 Module

The unit presented is the CAS 2 module responsible for key reading and start control in the BMW 1 Series E87. The controller manages key authorization, communication with the immobilizer, and interaction with other body control modules, which is crucial for vehicle security and proper engine starting.

Thanks to the use of an original BMW solution, full compatibility with the car's electrical architecture is maintained, as well as correct data bus communication with other control units.

Original BMW Part – Advantages of Use

The module comes from the BMW OE line, meaning it is a component designed directly by the vehicle manufacturer. In practice, this translates to:

• precise fit with the electrical system and wiring harnesses,
• software consistency with other control units in the vehicle,
• maintenance of factory operating parameters for comfort and security systems,
• reduced risk of communication errors compared to aftermarket alternatives.

Additionally, the module has an assigned OEM part number and relevant interchangeable numbers, which facilitates the selection of the correct control unit for a specific BMW 1 Series E87 configuration.

Technical Condition and Practical Application

The component is offered as a used part, allowing for economical repair of the electronic system while maintaining original BMW quality. This type of module is particularly useful for:

• diagnosing and resolving vehicle starting issues,
• faults related to key recognition or the immobilizer,
• the need to replace a damaged CAS 2 unit with a functional equivalent.

Before installation, it is recommended to verify compatibility with the vehicle using the part number and consult with an automotive electrician or electronics specialist regarding module programming and adaptation.

How to Select the Correct CAS 2 Module for BMW E87

To correctly select the module, it is worth paying attention to:

• compatibility with the CAS system generation (in this case, CAS 2),
• vehicle make and model – this controller is dedicated to the BMW 1 Series E87,
• OEM designations and available reference numbers, which allow matching the module to a specific equipment version.

If you want to better plan your car's maintenance and find out which electronic and mechanical system components are most frequently replaced, check out the guide: TOP 10 Most Frequently Replaced Parts in Your Car. This is practical support for planning repairs and optimizing operating costs.

Why Choose a Used OEM Part

Choosing a used, original BMW CAS 2 module is a sensible compromise between cost and quality. You receive a factory control unit, designed for a specific vehicle platform, without the need to invest in an expensive new part. You can find more about the advantages of original components over aftermarket alternatives in the article: Why Used Original OEM Parts Are a Safe and Cost-Effective Choice, which discusses the quality, safety, and durability of such solutions in detail.

Summary

The BMW 1 Series E87 ECU Key Reading Module Control Unit CAS 2 is an original BMW control module responsible for key operation and start authorization. As a used OEM part, it allows for professional yet cost-effective repair of the electronic system in the BMW 1 Series E87, while maintaining factory operating parameters and full integration with the vehicle's other systems.