Audi A4 B9 A5 F5 AdBlue SCR Control Unit Module 2.0 TDI 4M0907355H

Audi A4 B9 A5 F5 AdBlue SCR Control Unit Module is a specialized component from the Electronic control modules and controllers group, responsible for the precise management of the exhaust emission reduction system in diesel engines. The offered controller comes from the Audi range and is designed for vehicles equipped with an AdBlue SCR system, where it is responsible for controlling the dosing of the agent and cooperating with the rest of the powertrain electronics.

Specifications and technical data

• SKU: 4M0907355H
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0907355H
• Substitutable numbers: 4M0907355B, 4M0 907 355 B, 4M0907355H, 4M0 907 355 H
• Part type: Engine Control Unit (ECU)
• Category: ECUs & Computer Modules

Function and role of the AdBlue SCR controller

The presented module performs a key function in the exhaust gas treatment system, supervising the operation of the selective catalytic reduction system in the 2.0 TDI engine. Based on sensor signals, the controller calculates the AdBlue dosage, controls the operation of the pump and injector, and communicates with other vehicle controllers to maintain compliance with emission standards and stable operation of the power unit. Thanks to the use of an original module from the Electronic control modules and controllers group, software consistency, diagnostic logic, and CAN network communication are maintained, which reduces the risk of errors, warning messages on the dashboard, and the engine entering limp mode.

Benefits of using an original Audi module

Choosing a controller from an Audi vehicle allows you to maintain the factory operating parameters of the SCR system and facilitates service diagnostics. The module software is prepared to work with the onboard systems of these models, which translates into:

• stable operation of the exhaust emission reduction system,
• correct handling of messages and warning lights related to AdBlue,
• easier adaptation and coding during installation,
• preservation of factory engine safety logic. For the user, this means a lower risk of unplanned vehicle downtime, a reduction in costly service visits, and greater predictability of the car's behavior in extreme situations, e.g., at low AdBlue levels or incorrect sensor readings.

Professional selection and compatibility

To correctly select this controller for a specific Audi A4 B9 or A5 F5, it is recommended to verify compatibility by OEM number and interchangeable numbers, as well as to compare the hardware and software version with the previously installed module. In practice, the safest solution is to select by VIN number and consult with a diagnostician or a service center specializing in automotive electronics. If you want to deepen your knowledge about the selection and installation of used controllers, how to verify HW/SW compatibility, and practical aspects of installation, it is worth using the guide: Used automotive electronics – ECU modules and second-hand sensors in practice. You will find tips on diagnostics, coding, and the most frequently asked questions related to the installation of such components.

Condition, installation, and service application

The offered module is a used item, which in the case of automotive electronics often represents a reasonable compromise between repair cost and maintaining high part quality. This type of controller works well both for a typical replacement of a damaged module and for repairs of exhaust emission systems where it is necessary to replace several cooperating components. Before installation, it is recommended to:

• check the electrical installation and connectors for corrosion and mechanical damage,
• perform computer diagnostics before and after replacement,
• prepare an adaptation or coding procedure in accordance with the vehicle manufacturer's guidelines.

Expansion of the control system in Audi

If you are planning a comprehensive repair or modernization of the powertrain and exhaust emission control area in your Audi and need other elements from the same group, such as engine controllers, comfort modules, or units managing safety systems, check the available parts in the Audi electronic control modules and controllers category. Such an approach allows for consistent servicing of the entire electronic system, which is particularly important in modern vehicles where individual modules are closely integrated and the replacement of one element often requires verification of the operation of the others.