Audi A6 C8 AdBlue Additive Reservoir Fuel Tank TDI Diesel 4K0131878H

Visual condition of the part

The product shows signs of use visible in the photos.

Audi A6 C8 AdBlue Additive Reservoir Fuel Tank TDI Diesel is a fuel system component designed for diesel engines, responsible for storing the additive that reduces exhaust emissions. Thanks to the factory Audi design and compatibility with the diesel fuel system, this part ensures the proper operation of the exhaust treatment system and maintains stable performance parameters. This is the ideal solution for users looking for the original AdBlue system architecture for their A6 C8 TDI.

Specifications and technical data

• SKU: 4K0131878H
• Mark: Audi
• Condition: Used
• OEM Part Number: 4K0131878H
• Substitutable numbers: 4K0131878H, 4K0 131 878 H, 4K0131879E, 4K0 131 879 E
• Fuel type: Diesel
• Part type: Fuel Tank
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The described AdBlue additive reservoir is a component from the Fuel tanks and filler pipes group, working in conjunction with the diesel engine fuel system. Its task is to safely store the AdBlue solution and ensure a stable supply of the additive to the nitrogen oxide emission reduction system, which ensures the vehicle complies with exhaust emission standards.

Being dedicated to the Audi A6 C8 generation model with a TDI engine means that the geometry, mounting points, and connections are designed for the factory configuration of this car, which facilitates installation and reduces the risk of compatibility issues.

Compatibility and part identification

The component was developed by the Audi brand as part of the original fuel system for diesel units. By being assigned to a specific model and used in the AdBlue system, the reservoir works with the factory control electronics and fuel installation, maintaining the parameters specified by the manufacturer.

For proper identification, it is recommended to verify the OEM part number and interchangeable numbers in the specification tab, as well as to compare the configuration with the currently installed component. This selection method minimizes the risk of incompatibility and speeds up the service process.

Condition, installation, and service application

The offered AdBlue additive reservoir is a used part, making it an attractive cost-effective alternative to a new OEM component while maintaining the original design. This type of element is particularly useful for repairs to the fuel system and exhaust treatment system when the existing reservoir has suffered mechanical damage or internal wear.

Due to its factory origin, installation is based on original mounting points and connections, which facilitates workshop work and allows for the consistency of the entire system. Before installation, it is recommended to perform a standard check of tightness and the condition of the connections, in accordance with service procedures for fuel and AdBlue systems.

Benefits of using an original AdBlue reservoir

• Factory fit for the Audi A6 C8 diesel engine fuel system.
• Consistency with the AdBlue-based exhaust emission reduction system.
• Cost savings through the use of a used part while maintaining the original design.
• Easier installation thanks to serial mounting points and connections.

Using an original reservoir in the AdBlue system helps maintain stable operating parameters of the TDI unit, reduces the risk of system errors, and ensures the proper operation of the exhaust treatment system in the long term.

If you are planning a comprehensive repair or upgrade of the fuel and AdBlue additive system in your Audi and need other components from the same group, such as filler hoses, additional tanks, or mounting elements, check the available parts in the Audi fuel tanks and filler pipes category.

To better understand the relationships between the additive reservoir, the fuel system, and other components, it is worth reading the technical guide "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration", which discusses diagnostics, selecting parts by OEM numbers, and the principles of proper operation.