Audi Q5 8R 2.0 TDI Diesel AdBlue Additive Reservoir Fuel Tank 8R0131877N

Visual condition of the part

The product shows signs of use visible in the photos.

Audi Q5 8R 2.0 TDI Diesel AdBlue Additive Reservoir Fuel Tank is an original fuel system component, belonging to the Fuel tanks and filler pipes group, designed for diesel-powered vehicles. This used OEM part ensures factory-fit, proper integration with the exhaust emission reduction system, and stable operation of the AdBlue system in daily use.

Specifications and technical data

• SKU: 8R0131877N
• Mark: Audi
• Condition: Used
• OEM Part Number: 8R0131877N
• Substitutable numbers: 8R0131877N, 8R0 131 877 N
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The presented AdBlue additive reservoir is a component dedicated to Audi Q5 8R family vehicles equipped with a 2.0 TDI diesel engine. It is responsible for storing the AdBlue solution, which is dosed into the exhaust system to reduce nitrogen oxide emissions in Diesel engines. A properly functioning reservoir is crucial for the correct operation of the SCR system, preventing engine control unit errors, and maintaining compliance with emission standards.

Thanks to its factory design, the reservoir works with original hoses, sensors, and equipment, which facilitates installation and reduces the risk of leaks. Using an OEM part allows for maintaining the original architecture of the fuel and emission system without the need for aftermarket solutions.

Construction and fitment for Audi Q5 8R

The AdBlue additive reservoir has been designed specifically for the Audi Q5 8R platform, taking into account body geometry, hose routing, and mounting points. This means:

• factory placement of connection ports for AdBlue system hoses,
• retention of the original mounting position relative to the chassis and protective elements,
• compatibility with stock brackets, covers, and the wiring harness.

Such fitment translates into stable mounting, correct venting, and proper operation of the solution level and temperature sensors (if provided in the specific vehicle configuration). A used OEM reservoir is a good choice for repairs where maintaining the manufacturer's original specification is a priority.

Benefits of using an original AdBlue reservoir

Using an original AdBlue additive reservoir in an Audi Q5 8R 2.0 TDI brings a number of practical service and operational benefits:

• Factory compatibility – maintaining compliance with the fuel and exhaust system intended for the diesel engine.
• Stable SCR system operation – proper dosing of the AdBlue additive reduces the risk of the engine entering limp mode.
• Easier diagnostics – the engine control unit works with a component whose parameters are consistent with the manufacturer's documentation.
• Hassle-free installation – no need for system modifications, drilling additional holes, or altering hoses.

For workshops and users, this means shorter repair times, predictable vehicle behavior after replacement, and a reduced risk of recurring service interventions.

Used condition and service aspects

The offered reservoir comes from the secondary market, which allows for lower repair costs while maintaining the original design. When installing a used component, it is worth paying attention to:

• checking for leaks after installation in the vehicle,
• verifying the correct connection of hoses and electrical connectors,
• potential adaptation or clearing of errors in the engine control unit after replacement.

With proper installation, a used reservoir can effectively restore the efficiency of the AdBlue system and ensure the correct operation of the diesel engine in daily use.

Related fuel system components and technical support

During work on the fuel supply and AdBlue system, it is worth paying attention to the condition of hoses, sensors, and the fuel tank itself to avoid recurring faults. For those who want to better understand the relationships between the reservoir, pumps, and injectors, the following guide will be helpful: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

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