Mercedes W205 Diesel M626 OM651 Coolant Hose Ad Blue Cooling Feed Return Line

Mercedes W205 Diesel M626 OM651 Coolant Hose Ad Blue Cooling Feed Return Line is an original AdBlue dosing system component designed for diesel engines. This specialized hose from the Lines, hoses and pipes group ensures stable routing of the AdBlue coolant, supporting the proper operation of the exhaust emission reduction system in Mercedes vehicles with diesel units.

Specifications and technical data

• SKU: A2055012891
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055012891
• Substitutable numbers: A2055012891, A 205 501 28 91
• Fuel type: Diesel
• Color: Blue
• Category: Hoses, Lines & Pipes

Purpose and technical function

The hose has been designed for precise routing of the AdBlue coolant in the diesel engine supply system, particularly in Mercedes W205 class models with M626/OM651 units. It is responsible for the safe transport of the working medium between system components, which is essential for maintaining a stable operating temperature for parts responsible for nitrogen oxide reduction.

Thanks to a design tailored to factory mounts and installation routing, the hose minimizes the risk of leaks and improper positioning in the engine bay. This solution helps maintain the correct operating parameters of the AdBlue system, which translates into compliance with emission standards and proper interaction with the control electronics.

Construction, material and color

The element belongs to the Lines, hoses and pipes group, meaning it has been constructed with resistance to chemical and thermal factors typical of operating fluid systems in diesel engines in mind. The applied hose construction ensures adequate flexibility while maintaining shape stability, which facilitates installation in the tight space of the engine bay.

The characteristic blue color facilitates identification of the hose among other installations, which is helpful during diagnostics, service, and any system modifications. Clear visual distinction of the AdBlue hose from other operating fluid lines reduces the risk of assembly errors.

Benefits of using an original Mercedes hose

Choosing an original AdBlue coolant hose dedicated to diesel engines in the Mercedes W205 allows for maintaining the consistency of the entire system with the manufacturer's factory specifications. The appropriate diameters, length, and geometry of the hose promote proper medium flow and reduce mechanical stress on the connections.

A used part of this class is a reasonable compromise between cost and functionality – the hose retains its performance properties while allowing for reduced expenses related to AdBlue system maintenance. For vehicles used intensively, including fleet vehicles, this is significant both economically and operationally.

Application in diesel vehicles

The hose is intended for diesel-based systems, where the AdBlue system plays a key role in reducing exhaust emissions. Proper hose operation affects the stability of the entire exhaust purification system, which is important for component durability and the absence of AdBlue-related errors in the engine control unit.

Thanks to its fit for the architecture of M626/OM651 units, the hose works with factory brackets and guides, which facilitates installation and subsequent service activities. This solution is particularly beneficial for workshops specializing in servicing Mercedes vehicles with diesel engines.

Environmental and economic aspect

Choosing a used AdBlue coolant hose aligns with the principles of the circular economy – reusing functional components limits waste and reduces the demand for the production of new parts. This is a practical approach that allows you to combine budget care with a responsible approach to vehicle operation.

If you want to better understand how conscious selection of used components affects the environment and car maintenance costs, it is worth reading the article: Circular economy in your garage – how used parts support ecology and reduce repair costs.

Related hose system components in Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional lines, flexible hoses, or rigid pipes for operating fluids, check the available parts in the Mercedes lines, hoses and pipes category.