Mercedes SLK R172 C207 BlueTEC Adblue SCR Module Control Unit A0009003909

Mercedes SLK R172 C207 BlueTEC Adblue SCR Module Control Unit is a specialized component from the Electronic control modules and controllers category, responsible for the precise management of the exhaust emission reduction system in vehicles with BlueTEC technology. This used control unit allows for an economical yet professional repair of the SCR system, while maintaining the factory logic of Mercedes electronics.

Specifications and technical data

• SKU: A0009003909
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0009003909
• Substitutable numbers: A0009003909, A 000 900 39 09
• Category: ECUs & Computer Modules

Purpose and function of the SCR AdBlue module

The presented control unit is a component of the exhaust gas treatment system in Mercedes cars with BlueTEC engines, including the SLK R172 and C-Class C207 models. The module monitors the operation of the AdBlue injection system, controls the dosage of the agent, cooperates with temperature and exhaust composition sensors, and communicates with the main engine control unit to maintain compliance with emission standards.

By maintaining the original electronic architecture, the control unit ensures stable operation of the SCR system, reduces the risk of errors in the ECU memory, and allows for the proper functioning of emergency modes and onboard diagnostics.

Benefits of using an original Mercedes module

Using an original module from the Electronic control modules and controllers category translates into high compatibility with the vehicle's electrical installation and correct cooperation with factory software. This is particularly important in the case of exhaust emission systems, where slight deviations in parameters can result in error messages, power loss, or the vehicle entering a limited functionality mode.

The used component allows for reduced repair costs while maintaining original build quality, connector and housing fitment, and predictable behavior during computer diagnostics. This solution is often chosen by workshops specializing in the Mercedes brand that expect repeatable service results.

Professional installation and diagnostics

The Mercedes SLK R172 C207 BlueTEC Adblue SCR Module Control Unit requires installation in accordance with the manufacturer's procedures and subsequent configuration using an appropriate diagnostic tester. In many cases, it is necessary to:

• check the integrity of the electrical harness and connectors,
• update or adapt the software in the vehicle,
• verify the correct operation of NOx and temperature sensors,
• clear stored errors and perform functional tests of the SCR system.

This approach minimizes the risk of the AdBlue system fault messages reappearing and allows for full utilization of the capabilities offered by this control unit.

Product condition and practical application

The offered module is a used component, which in practice means it comes from vehicle dismantling and is intended for re-installation after prior verification. It is a reasonable choice for users who want to restore the efficiency of the SCR system without investing in a new subassembly, while maintaining compliance with Mercedes factory specifications.

Before installation, it is recommended to compare the vehicle configuration and consult with a workshop experienced in working with BlueTEC electronics to ensure the correct fitment of the control unit to the specific engine version and equipment.

More about used automotive electronics

If you are considering a wider replacement of electronic components in your car and want to make an informed decision on when it is worth choosing used control units, comfort modules, or sensors, check out our guide: The second life of electronics – when is it worth choosing used engine control units, comfort modules, and parking sensors?

If you are planning a comprehensive repair or upgrade of the control electronics area in your Mercedes and need other elements from the same group, such as engine control units, comfort modules, or safety system controllers, check the available parts in the Electronic control modules and controllers Mercedes category.