Audi A3 8P 2.0 TDI 170HP BMN Engine Control Unit ECU 03G906018DN Automatic

Visual condition of the part

The product shows signs of use visible in the photos.

Audi A3 8P 2.0 TDI 170HP BMN Engine Control Unit ECU Automatic is a specialized, used control module designed for diesel units with an automatic transmission. This component from the Electronic control modules and controllers group is responsible for the precise management of engine operation, fuel injection, and interaction with the automatic gearbox. It is a solution for users looking for proven engine electronics with factory performance characteristics.

Specifications and technical data

• SKU: 03G906018DN-2
• Mark: Audi
• Condition: Used
• OEM Part Number: 03G906018DN
• Substitutable numbers: 03G906018DN, 03G 906 018 DN, 5WP45567
• Fuel type: Diesel
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the engine controller

The presented engine computer has been designed to work with the 170 HP diesel unit in the Audi A3 8P, in the version with an automatic transmission. The controller manages key engine operating parameters, such as fuel dosage, boost pressure, injection corrections, and communication with other modules in the vehicle. This makes it possible to maintain stable engine operation, proper starting, and predictable throttle response.

The ECU module also plays an important role in supervising the interaction between the engine and the automatic transmission, which affects the smoothness of gear changes and the overall refinement of the drivetrain. Using a dedicated controller allows for the preservation of original maps and control strategies developed for this specific powertrain configuration.

Benefits of using a used ECU in an Audi A3 8P

Choosing a used engine computer for an Audi is a solution that allows you to reduce repair costs while maintaining the factory operating characteristics of the engine. A properly selected controller from the same hardware and software family enables:

• restoration of proper starting and stable idle speed,
• recovery of full power and torque intended for the 2.0 TDI 170 HP engine,
• proper cooperation with the automatic transmission,
• maintenance of communication with factory diagnostic and on-board systems.

A used module from this group is particularly attractive in situations where the existing controller has suffered electronic damage, has communication issues over the bus, or generates errors that are difficult to clear. In many cases, installing a functional ECU is a faster and more predictable solution than repairing an old module.

Selection, compatibility, and installation aspects

To ensure proper operation, it is crucial to match the controller to the specific engine version, fuel type, and transmission type. In this case, we are dealing with a diesel configuration and an automatic transmission, which must be taken into account when selecting the part. Hardware and software markings, as well as compatibility with the electrical system of the given Audi A3 8P, are also important.

Before installation, it is worth verifying compatibility by OEM number, interchangeable numbers, and vehicle data (VIN). In many cases, it is necessary to perform adaptation or programming of the controller using an appropriate diagnostic tester so that the module is correctly paired with the immobilizer and other vehicle systems. A properly selected and configured ECU allows for trouble-free operation and full utilization of the 2.0 TDI unit's capabilities.

Condition, practical application, and technical support

The offered engine computer is a used item, which in practice means a favorable cost-to-functionality ratio while maintaining the manufacturer's original specifications. Such modules are popular choices both for workshops specializing in automotive electronics and for informed users who are looking for a proven alternative to new components.

For those who want to deepen their knowledge on the selection and installation of used controllers, a guide describing the principles of verifying markings, hardware and software compatibility, and typical adaptation procedures will be useful – this is discussed in detail in the article Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. It allows for a better understanding of how to safely use used electronics and how to avoid common mistakes when replacing an ECU.

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, engine management modules, or related electronic systems, check the available parts in the Audi electronic control modules and controllers category.