034Motorsport Silicone Crankcase Breather Hose Kit for Audi A4 and A4 Quattro 1.8T (2004–2006)

This black silicone crankcase breather hose kit from 034Motorsport is built for later B6 Audi A4 and A4 Quattro 1.8T cars with the AMB engine and a VIN of 8E-3-500000 and up. It replaces the factory positive crankcase ventilation hoses and PCV valve. Those parts route blow-by gases from the crankcase through the oil separator and back into the intake. The factory plastic and rubber pieces harden and crack from constant heat, oil vapor, and pressure. 034Motorsport replaces them with silicone hoses and a simpler breather layout, and the kit includes all the hardware needed for the retrofit. The stock PCV valve is replaced by a 034Motorsport billet PCV valve. A billet aluminum block breather adapter seals with an o-ring and locks in with the factory retaining clip.

034Motorsport covers this kit with a 24-month warranty.

The VIN split decides which kit you need. Cars below 8E-3-500000 take 034-101-3004, which also includes a T-hose. This later-VIN kit replaces five factory parts with different part numbers:

• Valve cover breather hose 06B 103 221L
• Check valve to intake manifold hose 06B 103 224E
• Block breather tube 06A 103 213AM
• Valve cover breather tube 06B 103 213AK
• PCV valve 06A 103 245F, replaced by the billet PCV valve

A cap/plug eliminates the auxiliary check valve hose. The kit is sold complete and comes in black only. It is 48-state legal, but it lacks C.A.R.B. approval and may not be installed on California or New York cars. 034Motorsport was founded in 2005 and does its engineering and manufacturing at its facility in Fremont, California. This kit is made in the United States.

Technical Details

• Manufacturer: 034Motorsport
• Part number: 034-101-3003
• Engine code: AMB 1.8T
• VIN start: 8E-3-500000
• Hose material: silicone, black only
• Sold as a complete kit with billet PCV valve and billet aluminum block adapter
• Emissions status: 48-state legal, not C.A.R.B. approved
• Warranty: 24 months

Common Questions

How do I know my breather hoses have failed?
An intake air leak code, a misfire or rough idle, broken connectors, and oily residue around the hoses all point to the breather system.

Does it come in other colors?
No. It is sold only in black.

PMB Performance sells 034Motorsport breather kits for Audi 1.8T engines.

Fitment & Compatibility

Check the fitment table below for your model and year. Confirm the AMB engine code and a VIN of 8E-3-500000 or higher. PMB can confirm fit by VIN.