Audi A4 B7 Air Intake Breather Hose Pipe 2.0 TDI Diesel Engine 03G103426B

Audi A4 B7 Air Intake Breather Hose Pipe 2.0 TDI Diesel Engine is a component from the Lines, hoses and pipes group, designed for the crankcase ventilation system in diesel engines. A properly selected breather hose stabilizes engine operation, reduces blow-by, and helps maintain correct combustion parameters in a diesel engine.

Specifications and technical data

• SKU: 03G103426B
• Mark: Audi
• Condition: Used
• OEM Part Number: 03G103426B
• Substitutable numbers: 03G103426B, 03G 103 426 B
• Fuel type: Diesel
• Part type: Hose
• Category: Hoses, Lines & Pipes

Purpose and function in the engine system

The breather hose in an Audi with a diesel engine is responsible for the controlled discharge of gases from the crankcase into the intake system. A properly functioning component:

• stabilizes pressure in the crankcase,
• limits oil leaks resulting from overpressure,
• supports smooth engine operation under various loads,
• reduces the risk of excessive exhaust smoke. For diesel engines, it is particularly important to maintain the tightness and patency of the breather system, as this affects engine refinement, oil consumption levels, and the durability of auxiliary equipment.

Construction and fitment for Audi A4 B7

The air intake breather hose used in the Audi A4 B7 has been designed as a component matched to the geometry of the engine compartment, with appropriately shaped sections and connection ports. Thanks to this:

• the hose routing is stable and does not interfere with other components,
• connections to the intake system elements and the engine cover are airtight,
• the risk of chafing and leaks during operation is reduced. The component comes from the Audi brand, which helps maintain the factory characteristics of the breather system in the diesel engine.

Performance characteristics and installation benefits

Replacing the air intake breather hose in an Audi A4 B7 is recommended in the event of cracks, perished rubber, oiliness at the joints, or noticeable leaks. Using the correct hose allows you to:

• limit oil blow-by into the engine compartment,
• reduce the risk of contamination of the intake system,
• maintain stable operating parameters of the diesel unit,
• reduce unwanted odors and vapors in the engine compartment. The product is offered in Used condition, which represents a reasonable compromise between cost and maintaining the original specification of the component in the vehicle.

Why choose an original Audi breather hose

In diesel engine systems, the breather hose operates in demanding conditions – at elevated temperatures, in contact with oil vapors and exhaust gases. An original Audi component ensures:

• an appropriately selected material compound resistant to oil and temperature,
• factory fitment to ports and brackets in the engine compartment,
• consistency with other components of the ventilation system. If you are considering a choice between a used part and a cheap replacement, it is worth reading the analysis of costs and risks described in the article: cheap car part replacements – hidden defects and costs.

Expanding the hose system in an Audi

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 additional vacuum lines, intake system hoses, or breather pipes, check the available parts in the Audi lines, hoses and pipes category.