Audi A3 8P 2.0 TDI 170HP CFGB Engine ECU Unit Kit Key + Lock 03L906018AJ Manual

Audi A3 8P 2.0 TDI 170HP CFGB Engine ECU Unit Kit complete with key and lock is a practical set from the Electronic control modules and ECUs group, designed for vehicles with a diesel engine and manual transmission. The kit enables a consistent replacement of the engine control electronics along with immobilizer components, which facilitates matching to a specific vehicle. This solution is recommended for major engine control system repairs where component compatibility must be maintained.

Specifications and technical data

• SKU: 03L906018AJ
• Mark: Audi
• Condition: Used
• OEM Part Number: 03L906018AJ
• Substitutable numbers: 03L906018AJ, 03L 906 018 AJ, 0281016401, 0 281 016 401
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and kit configuration

The presented engine ECU kit with key and lock is dedicated to the Audi A3 8P with the 2.0 TDI 170HP engine in the CFGB version, working with a manual transmission. Combining the control module with the mechanical and electronic elements of the security system allows for maintaining the consistency of the immobilizer system and reduces the risk of start-up authorization issues after installation.

A kit configured in this way is particularly useful in situations where the existing ECU has suffered electronic damage or there are difficult-to-diagnose communication errors within the powertrain. Using a single, matched set facilitates workshop work and reduces the time required for configuration.

Technical characteristics and application

The ECU operates in a diesel engine environment, handling parameters typical for TDI units, such as fuel dosage, boost pressure, or injection corrections. Cooperation with a manual transmission means that the control logic is matched to the characteristics of the manual gearbox, which is important for smooth acceleration, throttle response, and the operation of driver assistance systems.

In practice, such a module is a key element managing the operation of the power unit, and its proper functioning affects:

• idle stability and engine refinement,
• load response and acceleration dynamics,
• control of exhaust emission parameters within factory settings,
• communication with other vehicle systems via the data bus.

Benefits of using a complete ECU + key + lock kit

Using a complete ECU kit with key and lock brings measurable service benefits. Immobilizer component consistency limits the need for deep programming from scratch and reduces the risk of conflicts between modules. For a workshop, this means a more predictable installation process, and for the user – a better chance of a quick return of the car to full efficiency.

In the case of higher-power TDI units, such as the 170HP version, a correctly selected ECU is important for maintaining the factory torque characteristics and flexibility. A used, functional module with a complete set of elements is a reasonable compromise between repair costs and maintaining the original engine operating logic.

Product condition and installation aspects

The offered kit comes from a used vehicle, which is a typical solution for original control modules for cars of this generation. Such components are often chosen by workshops specializing in the Audi brand because they allow maintaining compatibility with the vehicle's factory electrical architecture.

Before installation, a standard diagnostic procedure and verification of configuration compatibility with the specific vehicle are recommended. In many cases, it will be necessary to perform adaptation using appropriate service software to correctly integrate the kit with the rest of the vehicle's systems.

Expanding the control system in Audi

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

To better understand how original electronic modules affect the car's behavior and help preserve the brand's character, it is worth reading the article on our blog: Audi and emotions in their purest form. How do used parts help maintain the brand's DNA?.