Audi A4 B9 A5 F5 Ad Blue Tank Reservoir 2.0 TDI Diesel Engine 8W0131878BS

Audi A4 B9 A5 F5 Ad Blue Tank Reservoir 2.0 TDI Diesel Engine is an original component of the AdBlue additive supply system, designed for Audi vehicles with a diesel engine. The product belongs to the Fuel tanks and filler pipes group, making it the perfect replacement for the factory-installed exhaust emission reduction system in your car.

Specifications and technical data

• SKU: 8W0131878BS
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W0131878BS
• Substitutable numbers: 8W0131878BS, 8W0 131 878 BS
• Fuel type: Diesel
• Part type: Fuel Tank
• Color: Blue
• Category: Fuel Tanks & Filler Necks

Purpose and function in the vehicle

The presented Audi A4 B9 A5 F5 Ad Blue Tank Reservoir 2.0 TDI Diesel Engine is a component of the urea solution dosing system in Audi A4 (B9 generation) and Audi A5 (F5 generation) vehicles with a diesel engine. It is responsible for the safe storage of AdBlue fluid and its stable delivery to other system components, which enables the proper operation of the nitrogen oxide reduction system in the diesel engine.

Thanks to the use of a dedicated tank, the exhaust gas cleaning system maintains proper tightness, and the engine control unit receives the correct conditions to maintain compliance with emission standards. This is crucial for maintaining the efficiency of the power unit and avoiding errors and limp mode related to the AdBlue system.

Construction and technical features

The tank has been designed specifically to work with the supply system in vehicles powered by diesel fuel, which ensures compatibility with the factory Audi installation. The design provides appropriate connections for hoses and measuring elements, so that installation in place of the original component is orderly and predictable.

The housing in a characteristic blue color facilitates the identification of the element in the mounting compartment and clearly distinguishes it from classic fuel tanks. The arrangement of the connectors and mounts is adapted to the chassis architecture of the Audi A4 B9 and A5 F5, which limits the need for additional modifications during replacement.

Condition, fitment, and service application

The element comes from the used parts group, which allows for an economical repair of the AdBlue system while maintaining the manufacturer's original specifications. For proper selection, it is recommended to compare the tank configuration with the currently installed element in the vehicle and verify compatibility using factory markings.

Replacing the AdBlue tank is particularly recommended in the event of leaks, mechanical damage to the housing, or problems with maintaining pressure in the system. Using an original Audi component reduces the risk of improper interaction with the vehicle's electronics and allows for maintaining stable diesel engine operating parameters.

Benefits of installing an original AdBlue tank

• Compatibility with the factory system – a dedicated solution for the Audi A4 B9 and A5 F5 with a diesel engine.
• Consistency with the chassis architecture and AdBlue additive supply system.
• Possibility to restore the proper operation of the exhaust emission reduction system without interfering with the electrical installation.
• Economical service solution thanks to the use of a used part with original specifications.

Related system elements and further optimization

During work on the AdBlue system, it is worth paying attention to the condition of hoses, connectors, and mounting elements to avoid future disassembly. It is also good practice to check the tightness of the entire additive supply path and verify the correct operation of the sensors after installation is complete.

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

To better understand the relationships between the tank, pump, and other components of the supply system, it is worth reading the practical discussion in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration", where you will find tips on diagnostics and operation.