Audi Q7 4L Engine Vent Hose Cylinder Head Cover Breather 059103221T

Audi Q7 4L Engine Vent Hose Cylinder Head Cover Breather is an original crankcase ventilation system component, designed specifically for the first-generation Audi Q7 engine units. Thanks to its factory geometry and precise fitment, this used hose ensures proper oil vapor discharge and stable engine operation across a wide range of loads.

Specifications and technical data

• SKU: 059103221T
• Mark: Audi
• Condition: Used
• OEM Part Number: 059103221T
• Substitutable numbers: 059103221T, 059 103 221 T
• Part type: Line
• Category: Hoses, Lines & Pipes

Purpose and function in the engine system

The engine vent hose in the Audi Q7 4L operates within the crankcase ventilation system, connecting the breather components to the intake system. Its task is to direct oil vapors and gases from inside the engine for re-combustion, which reduces intake contamination and helps maintain stable pressure in the crankcase.

A functional hose in this location contributes to:

• reducing the risk of oil leaks and "false" air intake,
• smoother engine idle operation,
• maintaining correct air-fuel mixture parameters,
• limiting contamination of intake accessories.

Construction and fitment for Audi Q7 4L

The offered item belongs to the Hoses, pipes and tubes group, meaning it has been designed to operate in high-temperature environments and in contact with oil vapors. The shape and connection diameters are factory-matched to the Audi engine system, which facilitates installation and minimizes the risk of leaks after assembly.

The original Audi origin ensures the proper rigidity and flexibility of the hose, as well as compatibility with factory clamps and mounts. As a result, the component works well with other breather system parts without the need for modifications.

Condition, application, and benefits of installation

This is a used part, sourced from dismantling, intended for users who want to restore the proper operation of the engine ventilation system without investing in more expensive replacements. Replacing a worn or cracked hose with a functional unit helps reduce issues such as unstable RPM, exhaust odors in the engine bay, or excessive oiling of the intake.

The main advantages of using this hose in the Audi Q7 4L include:

• factory fitment for the specific engine configuration,
• retention of the original hose routing,
• possibility of an economical repair of the breather system,
• reduction of the risk of leaks in the ventilation area.

Why choose a used original hose

For components such as the engine vent hose, a used original part is often a better choice than a cheap replacement of uncertain material quality. The original hose maintains the correct geometry, and its parameters are consistent with the vehicle manufacturer's design assumptions, which promotes stable engine performance.

If you are considering whether refurbishment or installing a used part from dismantling is better in your case, the following article describing the differences between these solutions may be helpful: Refurbished or used original – which part to choose for repairs?.

Expanding your Audi breather system repair

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as vacuum lines, flexible intake hoses, or breather tubes, check out the available parts in the Audi Hoses, pipes and tubes category.