Audi A3 8V 1.4 TFSI CMBA 122HP Engine Control Unit ECU Kit 04E907309A Manual

Audi A3 8V 1.4 TFSI CMBA 122HP Engine Control Unit ECU Kit Manual is a control kit from the Electronic control modules and controllers group, designed for the 1.4 TFSI petrol engine paired with a manual transmission. The kit ensures precise engine management, enabling stable, predictable, and comfortable vehicle operation in everyday conditions.

Specifications and technical data

• SKU: 04E907309A-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 04E907309A
• Substitutable numbers: 04E907309A, 04E 907 309 A, 0261S07726, 0 261 S07 726, 5Q0937084N, 5Q0 937 084 N, 5WK50591
• Fuel type: Petrol
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented ECU control kit is dedicated to the Audi A3 8V drivetrain with a 1.4 TFSI CMBA 122HP petrol engine and a classic manual transmission. Its task is to coordinate key engine operating parameters, such as fuel dosage, ignition timing, and response to sensor signals, so that the engine operates in a repeatable and predictable manner across the full load range.

Thanks to appropriately selected software and configuration for the specific drivetrain specification, the controller supports proper engine starting, smooth acceleration, and stable idling, which translates into user comfort and consistent operation with other vehicle systems.

Benefits of using an original control module

Using an original module from the Electronic control modules and controllers group allows for maintaining the factory engine operating characteristics and compatibility with the vehicle's electrical system. Proper matching to the petrol engine and manual transmission reduces the risk of communication errors in the vehicle network and adaptation problems.

In practice, this means, among other things:

• consistent operation with factory diagnostic and service systems,
• proper cooperation with engine sensors and actuators,
• maintaining the engine operating parameters specified by the manufacturer.

For the user, this translates into stable performance, predictable throttle response, and the possibility of further service maintenance in accordance with the manufacturer's procedures.

Operating characteristics with a petrol engine and manual transmission

The 1.4 TFSI petrol engine requires precise control of the mixture and ignition, especially in the low and medium RPM range, where it is most frequently used in city traffic. The ECU kit in this configuration has been prepared for cooperation with a manual transmission, which means matching the control strategy to manual gear shifting and engine load characteristics.

Such tuning promotes smooth gear changes, reduces jerking during starting and downshifting, and supports even torque development under typical driving conditions. For the driver, this means a more natural clutch feel and predictable vehicle behavior during dynamic maneuvers.

Product condition and use in service practice

The offered ECU kit is a used component, which in workshop practice is often a beneficial solution for vehicle repairs following engine electronics failure or when it is necessary to replace a damaged controller. A properly selected module allows for restoring the efficiency of the drivetrain while maintaining reasonable maintenance costs.

Due to the specificity of control electronics, it is recommended to verify compatibility by OEM number and interchangeable numbers before installation, as well as to prepare an adaptation and potential programming procedure in accordance with the vehicle manufacturer's requirements. Such an approach minimizes the risk of improper engine operation after replacement.

Technical support and selecting the right ECU

In the case of engine control modules, it is crucial to match them correctly based on part numbers, software versions, and vehicle configuration. To better understand the principles of selecting used electronics, the differences between individual controller versions, and best installation practices, it is worth checking the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

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