Audi A4 8H B6 S4 B7 Charcoal Canister Pipe Hose Line 4.2 FSI 8E0201991AS

Audi A4 8H B6 S4 B7 Charcoal Canister Pipe Hose Line 4.2 FSI is an original component from the Lines, hoses and pipes group, designed for the fuel ventilation system in Audi vehicles with a 4.2 FSI engine. Designed by the vehicle manufacturer, it ensures proper routing of fuel vapors to the charcoal canister, which supports stable engine operation and compliance with emission standards.

Specifications and technical data

• SKU: 8E0201991AS
• Mark: Audi
• Condition: Used
• OEM Part Number: 8E0201991AS
• Substitutable numbers: 8E0201991AS, 8E0 201 991 AS
• Part type: Hose
• Category: Hoses, Lines & Pipes

Purpose and function of the charcoal canister pipe

The charcoal canister pipe in Audi A4 and S4 models with a 4.2 FSI engine is responsible for the controlled discharge of fuel vapors from the fuel system to the absorber (charcoal canister). A properly selected and airtight pipe:

• limits the emission of fuel vapors into the atmosphere,
• supports the correct operation of the EVAP system and engine control,
• minimizes the risk of diagnostic errors related to fuel system leaks,
• ensures stable operating conditions for the 4.2 FSI unit across various load ranges.

Construction and fitment for Audi

The offered pipe belongs to the Lines, hoses and pipes group and is structurally matched to the engine bay geometry in the Audi A4 8H B6 and S4 B7 with a 4.2 FSI unit. The properly profiled pipe routing:

• facilitates correct installation along factory mounting points,
• limits stress and twisting of the hose during engine operation,
• reduces the risk of abrasion in contact with other equipment components. Thanks to its factory origin, the pipe works with original connectors and brackets, which translates into predictable installation and repeatable system performance parameters.

Benefits of using an original Audi pipe

Using an original charcoal canister pipe in an Audi A4 or S4 with a 4.2 FSI engine allows for maintaining the consistency of the entire fuel system with the manufacturer's specifications. In practice, this means:

• stable engine operating parameters thanks to proper fuel vapor control,
• reduced risk of errors related to the EVAP system,
• easier diagnostics – the component is recognizable in Audi service documentation,
• reliable fitment for the specific body configuration and engine unit. This solution is particularly beneficial for repairs performed according to the manufacturer's guidelines, where maintaining the original system architecture is essential.

Component condition and service application

The pipe comes from dismantling and is offered as a used part, which allows for economical repair while maintaining the original Audi specification. This type of component is suitable both for replacing a damaged or leaking pipe and for a comprehensive rebuild of the fuel system in vehicles with a 4.2 FSI engine.

System expansion – selection of related components

If you are planning a comprehensive repair or upgrade of the fuel system area in your Audi and need other components from the same group, such as flexible hoses, rigid pipes, or ventilation system connectors, check the available parts in the Audi lines, hoses and pipes category. For a better understanding of the impact of properly functioning auxiliary installations on engine durability, you can also read an article describing the importance of an efficient cooling system and its components – you can find it here: Engine cooling system – overheating, repair and used radiators.