034Motorsport Breather Hose for Audi A4, A4 Quattro, and Volkswagen Passat (2000–2005)

The 034Motorsport 034-104-2001 is a replacement breather hose for the 2000–2003 Audi A4 and A4 Quattro and the 2000–2005 Volkswagen Passat. It replaces factory part number 058 103 493 A. 034Motorsport makes the hose in the United States. The company has built performance parts for Audi and Volkswagen since Javad Shadzi founded it in 2005.

This 034Motorsport hose carries a 24-month warranty.

A crankcase breather hose carries pressurized air from the crankcase to the air/oil separator, where oil vapor is removed and drained back to the engine. Constant heat, pressure, and oil vapor wear these hoses out, so they are a common failure item in the ventilation system. 034Motorsport designs, tests, and builds its parts in-house at its Fremont, California facility.

Technical Details

• Manufacturer: 034Motorsport
• Part number: 034-104-2001
• Replaces factory part number 058 103 493 A
• System: engine crankcase ventilation
• Made in the United States
• Warranty: 24 months

Common Questions

What are the signs of a failed breather hose?
Look for cracks, splits, or oil residue on the hose and nearby parts. A leak can also set a check engine light for an intake leak, and a severe leak can cause a misfire.

Which factory part does it replace?
It replaces factory part number 058 103 493 A.

Fitment & Compatibility

Check the fitment table below for the vehicles this hose fits. Send us your VIN and we will confirm the fit.