Audi A8 D4 Adblue Reduction Agent Tank Reservoir Bottle 4H0131877H

Audi A8 D4 Adblue Reduction Agent Tank Reservoir Bottle is a component of the exhaust emission reduction system, responsible for the safe storage of the urea solution used in the SCR system. Thanks to Audi's factory design and its precise fit for the A8 D4 platform, this component ensures stable operation of the exhaust treatment system and helps maintain the vehicle's compliance with emission standards, while reducing the risk of engine control unit errors.

Specifications and technical data

• SKU: 4H0131877H
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0131877H
• Substitutable numbers: 4H0131877H, 4H0 131 877 H, 4H0131879B, 4H0 131 879 B
• Category: Fuel Tanks & Filler Necks

Purpose and function in the AdBlue system

The offered reduction agent tank is part of the AdBlue dosing system in the Audi A8 D4 generation. It is responsible for stable storage of the agent and its delivery to other parts of the installation, which enables effective reduction of nitrogen oxides in the SCR catalyst. A properly functioning tank reduces the risk of air entering the system, suction problems, and warning messages on the dashboard.

As an element from the Fuel tanks and filler pipes group, this component works with the vehicle's fluid installation, ensuring proper tightness, resistance to temperature fluctuations, and chemical compatibility with the AdBlue solution.

Original origin and fitment for Audi

The product comes from the Audi OE line, which means it has been designed in accordance with the vehicle manufacturer's standards. The original design translates into:

• a secure fit to the body and mounting points in the Audi A8 D4,
• compatibility with the factory wiring and connector system,
• maintenance of the operating parameters specified by the manufacturer.

As a result, the tank is suitable as a replacement part in the event of damage, leaks, or operational problems with the existing AdBlue installation, without the need for modifications or adaptations.

Condition, application, and benefits of installation

The offered tank is a used component, which allows for an economical repair of the emission reduction system while maintaining the original Audi specification. Replacing a damaged or corroded tank with a functional component of this type helps to:

• restore the correct operation of the SCR and AdBlue dosing system,
• minimize the risk of leaks and odors associated with system leaks,
• limit the occurrence of engine limp mode associated with exhaust reduction system errors.

For workshops and private users, this means the possibility of efficient repair of the emission system while maintaining high assembly compatibility with the Audi A8 D4.

Selection by OEM number and technical support

The selection of the correct AdBlue tank for a specific version of the Audi A8 D4 should be based on the OEM number and vehicle data (VIN). In case of doubt, it is worth using the verification procedure based on part numbers and service documentation to avoid compatibility issues. Practical tips on identifying fuel system components and tanks can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which discusses diagnostics, selection by VIN/OEM, and operating principles.

If you want to organize the process of checking part compatibility with your car, the guide how to choose the right car part by VIN and OEM number will also be helpful, containing a step-by-step procedure and a list of key questions for the seller.

Expanding repairs within the tank system

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