Audi A6 C6 FL Power Steering Pump Fluid Reservoir Tank 4F0422371E

Audi A6 C6 FL Power Steering Pump Fluid Reservoir Tank is an original hydraulic system component designed for the facelifted Audi A6 C6 generation. It ensures stable fluid storage, proper venting, and safe operation of the power steering pump, which translates into precise and comfortable vehicle handling. Thanks to its factory design, the reservoir works perfectly with the Audi power steering system, minimizing the risk of leaks and system noise.

Specifications and technical data

• SKU: 4F0422371E-2
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F0422371E
• Substitutable numbers: 4F0422371E, 4F0 422 371 E
• Category: Power Steering Pumps

Function of the power steering fluid reservoir in the Audi A6 C6 FL

The presented reservoir is an integral part of the hydraulic system responsible for power steering. Its tasks include:

• maintaining the appropriate amount of operating fluid for the power steering pump,
• stabilizing pressure and reducing fluid foaming,
• filtering mechanical impurities in the circuit,
• ensuring proper system venting during operation.

Thanks to its proper design, the reservoir helps maintain smooth, predictable steering system operation, which is particularly important when maneuvering in the city and while driving at higher speeds.

Compatibility and fitment for the power steering system

The reservoir in question has been designed specifically for the Audi A6 C6 FL, which means factory-perfect fitment for hoses, brackets, and engine bay geometry. The original design ensures:

• correct positioning of connection ports relative to the pump and hoses,
• stable mounting at factory body points,
• compliance with the operating parameters of the power steering system used in this generation of the Audi A6.

Such fitment reduces the risk of stress on hoses, leaks, or improper fluid suction by the pump, which in the long run translates into less wear on power steering system components.

Characteristics of the used OEM component

The product comes from the original Audi parts group, which means it retains factory design and material parameters. Compared to cheap replacements, the used OEM reservoir offers:

• consistency with the design of the entire power steering system,
• retention of the operating capacity intended by the manufacturer,
• a properly shaped internal chamber that limits fluid cavitation.

Choosing a used OEM component is often a reasonable compromise between cost and durability, especially for components such as the fluid reservoir, where maintaining correct geometry and material quality is crucial.

Operation and symptoms of power steering reservoir wear

During vehicle operation, the power steering fluid reservoir may be subject to natural wear, which manifests itself through, among other things:

• micro-cracks in the body and fluid seepage,
• internal contamination that can affect filtration,
• damage to connection ports.

Replacing the reservoir is recommended when leaks occur, fluid levels drop for no apparent reason, or pump noise is caused by air suction. Installing a functional component restores stable power steering system operation and reduces the risk of costly pump failure.

Connection to other system components and part selection

During hydraulic system service, it is worth paying attention not only to the reservoir but also to the hoses, seals, and the power steering pump itself. Proper selection of components according to manufacturer markings and vehicle specifications allows you to avoid compatibility issues and ensures consistent operation of the entire system.

If you are interested in a broader context of selecting and diagnosing power supply elements and the operation of hydraulic and fuel systems, an article describing the principles of selection by manufacturer markings, diagnostics, and regeneration may be helpful – you can find it here: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Expanding Audi power steering service

If you are planning a comprehensive repair or upgrade of the steering system area in your Audi and need other elements from the same group, such as a pump, pressure hoses, or return hoses, check the available parts in the Audi Power Steering Pumps category.

For drivers who are simultaneously dealing with broader drivetrain service, information on the cost-effectiveness of using original used components may also be useful – you can find more on this topic in the guide: Humming differential? Why a used OEM drive axle is a better investment than an uncertain replacement.