Audi A3 8P 1.4 TFSI CAXC 125HP Engine Control Unit ECU 03C906016G Automatic

Audi A3 8P 1.4 TFSI CAXC 125HP Engine Control Unit ECU is a factory-made electronic control module designed for the 1.4 TFSI CAXC unit paired with an automatic transmission. This used control unit from the Electronic control modules and ECUs category allows for professional powertrain repair without the need for costly engine replacement. It is a solution for users who expect proven electronics with parameters consistent with the original Audi configuration.

Specifications and technical data

• SKU: 03C906016G
• Mark: Audi
• Condition: Used
• OEM Part Number: 03C906016G
• Substitutable numbers: 0261S04653, 0 261 S04 653, 03C906016F, 03C 906 016 F, 03C906016G, 03C 906 016 G
• Gearbox type: Automatic
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Purpose and function of the control unit

The engine control unit (ECU) in the Audi A3 8P 1.4 TFSI CAXC is responsible for precise management of the powertrain, including fuel injection, ignition, and communication with the automatic transmission. Using a dedicated module for the 125 HP version ensures consistency with the factory engine characteristics, which translates into stable operation across the full load range. It is a key component for maintaining proper dynamics, smooth operation, and predictable throttle response.

Compatibility and integration with the powertrain

The presented control unit is designed to work with an automatic transmission, which is crucial for proper communication with the mechatronics, torque management system, and safety systems. This allows for maintaining correct gear shift patterns, smooth starting, and stable operation in driving modes provided by the manufacturer. The module should be treated as a component intended for further configuration (coding, adaptation) in accordance with Audi service procedures.

Application in service practice

Replacing the engine control unit in an Audi A3 8P 1.4 TFSI CAXC is a commonly used solution for issues with ECU communication, internal module errors, or damage originating from the electrical installation. A used control unit helps reduce repair costs while maintaining the vehicle's factory electronic architecture. In workshop practice, such a module is typically:

• prepared for further programming for a specific vehicle,
• used as a base for cloning data from a damaged ECU,
• installed in vehicles after accident repairs or engine replacements.

For proper operation, it is necessary to perform appropriate diagnostic and adaptation procedures using specialized equipment.

Benefits of choosing a used control unit

By choosing a used engine control unit for your Audi, you gain the ability to restore vehicle functionality while maintaining a favorable cost-to-effect ratio. Original Audi electronics ensure proper fitment with the installation, wiring harnesses, and other modules in the vehicle, which minimizes the risk of compatibility issues. This is particularly important in modern systems where the engine control unit interacts with numerous safety and comfort systems.

Technical support and electronics selection

If you are considering installing a used ECU and want to better understand what to look for when selecting and programming the module, it is worth using practical tips. A detailed discussion of the topic can be found in the article The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?, which describes, among other things, the selection, testing, and safe installation of automotive electronics.

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