Mercedes W205 Diesel AdBlue Additive Fuel Tank Reservoir A2054703901

Mercedes W205 Diesel AdBlue Additive Fuel Tank Reservoir is an original component of the AdBlue additive supply system, designed for diesel vehicles. Thanks to its factory design, it ensures proper storage and delivery of the AdBlue solution, which translates into stable operation of the exhaust gas treatment system. This is a solution for users who expect compatibility with the factory SCR system in Mercedes C-Class W205 generation models with a diesel engine.

Specifications and technical data

• SKU: A2054703901-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2054703901
• Substitutable numbers: A2054703901, A 205 470 39 01
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel and emission system

The presented AdBlue fluid reservoir operates in Mercedes diesel vehicles, where it contributes to the nitrogen oxide emission reduction system. Its task is to safely store the urea solution and ensure a stable supply to the dosing module, which enables the proper operation of the SCR system and compliance with exhaust emission standards.

This element belongs to the Fuel tanks and filler pipes group, however, in this case, it is responsible for the AdBlue fluid circuit, working in conjunction with the fuel system and engine control. A properly selected reservoir reduces the risk of diagnostic errors related to the exhaust gas treatment system and helps maintain stable engine performance parameters.

Construction and fitment for Mercedes W205 Diesel

The reservoir has been designed specifically for the body architecture of the Mercedes W205 with a diesel unit. This means the shape, mounts, and connection ports are matched to the factory mounting points in this model. As a result, installation is straightforward, without the need for body or system modifications.

The layout of the ports and connections is adapted to the standard routing of AdBlue fluid lines and electrical wiring, which facilitates maintaining system tightness and proper fluid circulation. Such a solution promotes seamless integration with the vehicle's existing fuel and emission system.

Benefits of using an original AdBlue reservoir

Using a dedicated reservoir in a Mercedes W205 Diesel brings a number of practical operational benefits:

• preservation of the factory performance characteristics of the SCR and fuel system in the diesel engine,
• reduced risk of leaks and problems with venting the AdBlue installation,
• proper cooperation with sensors and exhaust gas treatment equipment,
• easier computer diagnostics due to compliance with factory parameters.

For the user, this means stable operation of the diesel engine, a lower risk of the unit entering limp mode, and maintaining required exhaust emission levels without the need for substitute solutions.

Characteristics of the used component

The offered AdBlue fluid reservoir is a used part, sourced from vehicle dismantling. Such components are often chosen as an economical alternative to new parts, while maintaining the original design and fitment for a specific model. In the case of AdBlue reservoirs, it is crucial to maintain the integrity of the housing and the correct connection layout, which enables further operation in the vehicle.

For informed users and workshops, choosing a used reservoir is a way to reduce repair costs while maintaining the factory specifications of the system. Combined with proper installation and diagnostics, this allows for effective and predictable operation of the exhaust gas treatment system.

Selection, diagnostics, and operation of the fuel system

When replacing the AdBlue reservoir in a Mercedes W205 Diesel, it is worth paying attention to the general condition of the fuel and emission system, including lines, the AdBlue injector, as well as pumps and control elements. Proper selection of parts according to manufacturer markings and diesel engine configuration reduces the risk of incompatibility and facilitates subsequent computer diagnostics.

To better understand the relationships between the reservoir, pumps, injectors, and the rest of the installation, a guide describing the construction and maintenance of the supply system will be helpful. A detailed discussion can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, where the principles of diagnostics, selection by manufacturer markings, and operation are presented.

Expanding repairs within the scope of tanks and filler pipes

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

If you want to better assess the validity of using dismantled parts and learn the facts about their durability and cost-effectiveness, the guide Used car parts: Myths and facts you need to know, which discusses the practical aspects of choosing used components in modern vehicles, may be helpful.