034Motorsport Silicone Intake Manifold Crankcase Breather Hose for Volkswagen Jetta and Golf (2001–2003)

Running from the bottom of the intake manifold to the check valve on the lower block breather hose, the 034Motorsport 034-101-3037 is a fully reinforced silicone crankcase breather hose for the Volkswagen Jetta and Golf. It replaces Volkswagen part 06A 103 221 BK, a factory rubber hose known for crumbling and leaking. On a turbocharged engine, a leak at this hose is a boost leak as well as a crankcase leak. 034Motorsport builds this version from automotive silicone with reinforcement through the full length. It is made in the United States, and hose clamps are included.

This 034Motorsport hose carries a 24-month parts warranty.

Position is what separates this hose from the other breather lines on the same engine. This one sits between the intake manifold and the check valve fitted to the lower block breather hose. The breather hose that runs from the block up to the valve cover is a separate part, so match the run you are replacing before ordering. Breather hoses in a crankcase ventilation system carry pressurized crankcase air and oil vapor to be burned in the intake. Heat and oil vapor break down rubber over time, which is why the factory hose in this spot is a common failure point.

Technical Details

• Manufacturer: 034Motorsport
• Part number: 034-101-3037
• Replaces Volkswagen part number: 06A 103 221 BK
• Material: fully reinforced automotive silicone
• Position: bottom of the intake manifold to the check valve on the lower block breather hose
• Includes: hose clamps
• Made in the United States
• Warranty: 24 months

Common Questions

Will a leaking hose here cause a boost leak?
Yes. A crumbling hose at this location can leak boost. 034Motorsport makes this part specifically to address that weak point in the factory rubber hose.

How can I tell if the factory hose has failed?
Look for cracks, splits, or oil residue on and around the hose. An intake leak from a failed breather hose can also set a check engine light or cause a misfire.

Are clamps part of the order?
Yes. Hose clamps come with the hose.

PMB sells this silicone hose for Volkswagen owners chasing breather leaks under the manifold.

Fitment & Compatibility

Use the fitment table below to confirm your vehicle. Make sure the hose you are replacing is the one between the intake manifold and the check valve. PMB will check fit against your VIN if you send it before ordering.