Audi RS4 B8 4.0 FSI CFSA Petrol Coolant Hose Upper Top Left O/S 8K0133889B

Audi RS4 B8 4.0 FSI CFSA Petrol Coolant Hose Upper Top Left O/S is an original component from the Cooling system hoses and pipes group, designed for the petrol engine. It ensures stable coolant flow in the upper part of the system, which is crucial for maintaining the correct operating temperature of the engine unit. This solution is dedicated to a specific body and engine configuration, which facilitates fitting during service.

Specifications and technical data

• SKU: 8K0133889B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0133889B
• Substitutable numbers: 8K0133889B, 8K0 133 889 B
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and function in the cooling system

The described hose is a cooling system component located on the left side, operating in the fluid circuit of the petrol engine. Its task is to provide a secure and leak-proof connection of system components so that the coolant flow remains stable under both low and high engine loads. Thanks to its factory-specified shape and diameter, the hose maintains the correct routing geometry, which reduces the risk of kinks and local flow restrictions.

Original Audi fitment

As a part prepared by Audi, the hose is structurally matched to the RS4 B8 engine bay with the 4.0 FSI CFSA unit. This means compatibility with factory mounting points, appropriate length, and a profile that accounts for adjacent auxiliary components. In practice, this translates into easier installation, correct positioning in the engine bay, and a lower risk of improper material stress during operation.

Performance characteristics of the used part

The hose comes from the secondary market, which is a beneficial solution for users looking for original components at a reasonable price. The used element retains its factory geometry and routing, while allowing for the consistency of the cooling system with other components to be maintained. In the case of cooling system hoses, it is important to maintain structural compliance with the manufacturer's design – using an original solution promotes the predictable operation of the entire system.

Technical support and knowledge about the cooling system

When replacing cooling system hoses, it is worth paying attention to the general condition of the entire circuit, including other hoses, the radiator, and flow control elements. For drivers who want to better understand the impact of an efficient cooling system on engine longevity, the guide article Engine cooling system – overheating, repair, and used radiators, which discusses practical aspects of diagnostics and service, will be helpful.

Comprehensive Audi cooling system service

If you are planning a comprehensive repair or upgrade of the cooling system area in your Audi and need other elements from the same group, such as additional pipes, hoses, or flexible connections, check the available parts in the Audi cooling system hoses and pipes category.

For users interested in a broader perspective on selecting original components from the secondary market, a guide on used components may also be useful, available at the link Best used car parts – a guide to the most frequently chosen original parts, which helps in consciously planning vehicle repairs and upgrades.