Audi A4 B8 A8 D4 Windscreen Washer Bottle Tank Reservoir 4H0955451B

Audi A4 B8 A8 D4 Windscreen Washer Bottle Tank Reservoir is an original washer system component designed for installation in Audi vehicles. As part of the Washer fluid tanks, pumps, and nozzles group, it ensures a stable supply of washer fluid to the system, which translates into safe and comfortable visibility while driving. Using an OEM component is a sensible choice for drivers looking for a technically matched solution at an attractive price.

Specifications and technical data

• SKU: 4H0955451B
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0955451B
• Substitutable numbers: 4H0955451B, 4H0 955 451 B
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and function in the washer system

The presented reservoir is a component of the system responsible for storing washer fluid for the windshield and, depending on the vehicle configuration, also for the headlights. Its task is to maintain the appropriate amount of fluid and ensure a stable supply to the pump so that the washer system operates predictably under various road conditions.

Thanks to the factory design specifically for the Audi A4 B8 and A8 D4 models, the reservoir maintains the correct mounting points, a shape adapted to the wheel arch compartment, and the locations for connectors and accessories provided by the manufacturer. This allows for maintaining the original geometry of the system and minimizes the risk of leaks.

Construction and mounting fit

As an OEM part, the reservoir has been designed for precise fitment with the bodywork and other components of the washer system. The properly shaped housing allows for:

• secure seating in factory mounting points,
• proper routing of fluid lines,
• correct positioning of connectors and sockets for accessories.

Such fitment limits stress on the lines, reduces the risk of cracks, and facilitates future service. The original geometry of the reservoir also helps maintain the correct fluid level in various vehicle positions.

Benefits of using an original used reservoir

Choosing a used, factory-made washer fluid reservoir is a compromise between cost and quality. You receive a component designed by the vehicle manufacturer, with maintained compatibility with factory mounts and accessories, without the need for modifications or adapting universal solutions.

The main advantages of this solution include:

• secure fit for a specific Audi model,
• preservation of the original washer system concept,
• reduced installation time thanks to the plug-in nature of the part,
• an economical approach to repair while maintaining OEM standards.

Practical installation and maintenance tips

When replacing the reservoir, it is worth checking the condition of the lines, seals, and the washer pump itself. Replacing several components simultaneously within one system allows for reducing the number of service downtimes and ensures more predictable operation of the entire system. It is also good practice to flush the installation before filling it with fresh fluid to remove any potential sediment.

If you are planning a comprehensive repair or upgrade of the area responsible for the cleanliness of windows and headlights in your Audi and need other elements from the same group, such as additional reservoirs, pumps, or washer nozzles, check the available parts in the Audi washer fluid tanks, pumps, and nozzles category.

Part selection by numbers and technical support

To ensure full compatibility with a specific body version and equipment, it is worth verifying the selection of the reservoir by catalog numbers or based on vehicle data. This approach reduces the risk of purchasing a component with a different shape or different connector layout, which is particularly important in the case of models available in many variants.

For those who want to deepen their knowledge on the diagnostics and selection of power supply system components and working with OEM numbers, the guide article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration" may be helpful, where practical rules for identifying parts by numbers and vehicle data are discussed.

If you are considering when it is worth reaching for a used component, and when for a new replacement or a factory part, it is worth reading the material "Original, replacement, or used – which car parts are the most cost-effective?", where you will find a comparison of costs, durability, and fitment of different types of parts.