Audi A8 D3 Power Steering Fluid Reservoir Tank 3.0 TDI 3.2 Petrol 4E0422373N

Audi A8 D3 Power Steering Fluid Reservoir Tank 3.0 TDI 3.2 is an original hydraulic system component designed for use in vehicles with diesel and petrol engines, including versions with Petrol fuel type. Designed by the vehicle manufacturer, it ensures stable operating conditions for the power steering pump and pressure lines, which translates into predictable, comfortable vehicle handling. It is a practical solution for users who want to restore the proper operation of the steering system without interfering with the vehicle's construction.

Specifications and technical data

• SKU: 4E0422371N-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 4E0422371N
• Substitutable numbers: 4E0422371J, 4E0 422 371 J, 4E0 422 371 N, 4E0422371N
• Fuel type: Petrol
• Category: Fuel Tanks & Filler Necks

Purpose and function in the steering system

The presented power steering fluid reservoir is responsible for storing and pre-bleeding the working medium in the hydraulic steering system. A correctly selected and leak-free reservoir reduces the risk of cavitation, pressure drops, and pump noise, which has a direct impact on the smoothness and precision of the steering gear. Combined with the appropriate return and supply lines, it constitutes an integral part of the system that must be structurally matched to the specific generation of the Audi A8 D3.

Benefits of using an original reservoir

Using an original power steering fluid reservoir in an Audi allows for maintaining the factory operating parameters of the system. This means:

• stable operating pressure across a wide range of engine operating temperatures,
• proper fluid flow, reducing aeration and foaming,
• compatibility with factory brackets, lines, and mounts in the engine bay,
• maintaining the power steering system capacity specified by the manufacturer. As a result, the driver receives predictable steering force characteristics, and components such as the pump or steering gear are less exposed to overloads. This is particularly important in heavier, well-equipped luxury sedans like the Audi A8, where the power steering system operates under significant load.

Characteristics of the used component

The offered reservoir comes from dismantling and is a used component, which represents a reasonable compromise between repair costs and maintaining the original vehicle specification. In practice, this means the ability to restore the efficiency of the power steering system while maintaining factory geometric and material fitment. A used component of this type is often chosen for maintenance repairs, such as eliminating leaks, replacing a cracked reservoir body, or upgrading the system after previous unsuccessful repairs.

Integration with the fuel system and engine supply

Although the power steering fluid reservoir is not a component of the fuel supply system, its proper operation affects the overall refinement of the vehicle, including petrol-powered units. Stable vehicle handling facilitates the diagnostics and servicing of other components, such as the injection system or fuel rails. If you are planning broader service work on the engine supply, it is worth checking the guide on selecting components from dismantling – detailed tips can be found in the article Fuel dosing problems – how to safely choose a used injection pump and fuel rail.

Comprehensive service of the supply and hydraulic zone in Audi

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

Summary

Audi A8 D3 Power Steering Fluid Reservoir Tank 3.0 TDI 3.2 is a practical solution for users who want to restore the proper operation of the power steering system while maintaining the original vehicle construction. A properly selected, used component allows for reducing service costs while maintaining the correct operating parameters of the hydraulic system and the driving comfort characteristic of this class of car.