Audi A4 B8 Q7 4L A8 D4 Fluid Pump Unit SCR AdBlue Reservoir 3.0 TDI 4L0131901

The Audi A4 B8 Q7 4L A8 D4 AdBlue Tank SCR Pump 3.0 TDI is an original AdBlue dosing system component designed for Audi vehicles with a 3.0 TDI engine equipped with an SCR system. The integrated tank with a pump is responsible for the precise delivery of AdBlue solution to the exhaust system, enabling the proper functioning of the nitrogen oxide reduction system and stable engine operation.

Specifications and technical data

• SKU: 4L0131901-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 4L0131901
• Substitutable numbers: 4L0131901, 4L0 131 901
• Category: Additional Fuel Injection Parts

Purpose and Function in the SCR System

The presented AdBlue tank with SCR pump is an injection system component responsible for preparing and delivering the agent to the selective catalytic reduction catalyst. A correctly functioning module ensures:

• stable operating pressure in the AdBlue circuit,
• accurate solution dosing according to the engine control unit map,
• compliance with emission standards for the specific model,
• reduced risk of the engine entering limp mode due to SCR system errors.

By using an original solution, the AdBlue injection system maintains its factory operating parameters, which translates to predictable vehicle behavior and proper cooperation with the control electronics.

Compatibility with Audi 3.0 TDI Models

The AdBlue tank with SCR pump is designed to work with selected versions of Audi A4 B8, Q7 4L, and A8 D4 with the 3.0 TDI engine. This means that the mounting geometry, connection ports, and electrical connectors are adapted to the factory installation in these models, facilitating installation and minimizing the need for modifications.

Before purchasing, it is advisable to verify the part's compatibility with the specific vehicle equipment version, model year, and exhaust system used. Proper component matching helps avoid communication issues with the engine control unit and diagnostic trouble codes.

Component Characteristics and Benefits of Using OEM Parts

The offered component belongs to the Other Injection System Parts group, but in practice, it plays a crucial role in exhaust gas purification and cooperation with the diesel engine's injection system. Using an original Audi OE solution ensures:

• maintenance of factory SCR system operating parameters,
• proper cooperation with the engine control unit software,
• adequate chemical resistance to the AdBlue solution,
• structural consistency with other exhaust system components.

A used part allows for an economical repair of the system while maintaining the quality characteristic of OEM parts, which is particularly important for complex AdBlue dosing systems.

Practical Benefits of Replacing the AdBlue Tank with SCR Pump

A functional AdBlue tank with SCR pump impacts the daily operation of the vehicle in several areas:

• reduces the risk of AdBlue system error messages on the instrument cluster,
• limits the possibility of the engine entering reduced power mode,
• supports maintaining proper fuel consumption through correct operation of the exhaust gas purification system,
• helps maintain vehicle compliance with environmental requirements and technical inspections.

For owners of Audi A4 B8, Q7 4L, and A8 D4 with the 3.0 TDI engine, this solution allows for the restoration of full SCR system functionality without the need for costly interventions in the electronics or exhaust system.

Used Condition vs. Purchase Profitability

Choosing a used, original AdBlue tank with SCR pump is often a sensible compromise between cost and quality. An OEM part retains its factory design and operating parameters while significantly reducing repair costs compared to a new component. For informed users and workshops specializing in the Audi brand, this is a solution that enables effective repair while maintaining a high level of reliability.

If you want to better understand the differences between new and used components, their durability, and the total cost of ownership, it is worth reading the guide material New or Used? A Comparison of Car Part Costs and Quality, where you will find practical examples and tips for selecting parts.

Related Audi Injection System Components

If you are planning a comprehensive repair or upgrade of the injection system and exhaust gas purification system in your Audi and need other components from the same group, such as agent supply lines, dosing valves, or additional AdBlue cooperating modules, check the available parts in the Other Audi Injection System Parts category.