Audi A5 8T 2.0 TDI CNHA Diesel Adblue Reservoir Fuel Tank Passive 8K0131878H

Audi A5 8T 2.0 TDI CNHA Diesel Adblue Reservoir Fuel Tank Passive is an original fuel system component designed for diesel vehicles, engineered specifically for the Audi brand. Thanks to its factory design, the reservoir works in conjunction with the exhaust emission reduction system, ensuring a stable supply of AdBlue solution to the SCR system. This is a practical solution for users who want to restore the full efficiency of the exhaust treatment system in their vehicle.

Specifications and technical data

• SKU: 8K0131878H
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0131878H
• Substitutable numbers: 8K0131878H, 8K0 131 878 H
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The presented AdBlue reservoir belongs to the Fuel tanks and filler pipes group; however, its task is to store the urea solution used in the selective catalytic reduction system. In diesel-powered cars, it is responsible for the safe storage of the working medium and its stable delivery to other components of the installation. A properly selected reservoir reduces the risk of leaks, system errors, and a decrease in the effectiveness of nitrogen oxide reduction.

Compatibility with the 2.0 TDI CNHA unit

The model used in the Audi A5 8T with the 2.0 TDI CNHA unit is structurally matched to the body architecture and the routing of the AdBlue system lines. The appropriate shaping of the connection ports and mounting points facilitates installation in factory locations without the need for system modifications. This ensures proper cooperation with sensors, lines, and other components of the emission reduction system in the diesel engine.

Technical and operational characteristics

The reservoir has been designed to operate in demanding operational conditions typical for vehicles powered by Diesel fuel. The construction provides resistance to temperature changes, vibrations, and contact with the AdBlue solution, which reduces the risk of damage over the long term. The appropriate geometry of the reservoir supports proper venting and stable fluid suction by the system, which is important for the operation of the engine controller and maintaining emission standards.

Condition, origin, and benefits of choosing this part

The offered element comes from the Audi parts group and is marked as used, which allows for combining factory fitment with a cost-effective repair. Choosing an original AdBlue reservoir from this series is a way to maintain compliance with the vehicle's factory specifications, without compromises in terms of construction and mounting geometry. For workshops and individual users, this means easier installation and predictable system behavior after replacement.

Technical support and selection by part numbers

When selecting an AdBlue reservoir for a specific version of the Audi A5 8T, it is worth using the manufacturer's markings and catalog data to ensure full compatibility with the vehicle's fuel and emission system. In case of doubt, information about part numbers, interchangeable numbers, and vehicle data, such as engine type or production year, can be helpful. A well-selected reservoir minimizes the risk of controller errors, leaks, and problems with system venting.

To better understand the role of the reservoir in the entire fuel supply and exhaust treatment path, it is worth reading the guide describing the construction and servicing of the fuel system, which discusses, among other things, diagnostics, part selection by numbers, and operating principles – details can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

If you are planning a comprehensive repair or modernization of the fuel supply and fluid storage area in your Audi and need other elements from the same group, such as additional reservoirs, filler pipes, or mounting elements, check the available parts in the Audi fuel tanks and filler pipes category.