URO 077103221N Engine Crankcase Breather Hose

Crankcase Breather Hose for V8 Applications

This URO engine crankcase breather hose restores the connection between the crankcase cover and the crankcase vent valve when the original hose fails. It is a direct-fit replacement for select Audi A8 Quattro, Audi A6 Quattro, Volkswagen Touareg, and Volkswagen Phaeton applications, including part number 077103221N.

Key Features

• Made from AEM material for resistance to engine heat and oil vapor exposure
• Molded hose design for accurate routing and OE-style fitment
• One-branch configuration with two hose connectors
• Replaces a failed crankcase breather hose to restore ventilation flow
• Supports proper hydrocarbon emission control through crankcase ventilation
• Backed by a 24-month unlimited mileage warranty

Detailed Description

URO 077103221N is an engine crankcase breather hose built for the crankcase ventilation system. Its molded construction helps maintain the original hose path from the crankcase cover to the crankcase vent valve, which is important for stable crankcase pressure control and emission system operation. The AEM material is selected to better resist cracking and splitting caused by heat cycling and oil vapor exposure. This part cross-references URO-012273 for the same application.

Compatible With 2004-2007 Volkswagen Touareg, crankcase cover to crankcase vent valve; 2000-2006 Audi A8 Quattro, crankcase cover to crankcase vent valve; 2004-2006 Volkswagen Phaeton, crankcase cover to crankcase vent valve; and 2000-2004 Audi A6 Quattro, crankcase cover to crankcase vent valve. The part number 077103221N is also commonly searched for these vehicle-specific crankcase ventilation repairs.

What It Helps Fix

• Cracked or split crankcase breather hose
• Vacuum leaks in the crankcase ventilation circuit
• Oil vapor odor from a deteriorated hose
• Improper crankcase pressure regulation
• Emission control faults related to breather hose failure

Installation Notes and Tips

Inspect the full crankcase ventilation path before installation and replace any brittle or oil-soaked adjacent hoses as needed. Confirm the hose is routed exactly as the original part between the crankcase cover and crankcase vent valve to preserve proper fitment on Audi A8 Quattro, Audi A6 Quattro, Volkswagen Touareg, and Volkswagen Phaeton models. Verify the OE part number 077103221N against the removed hose before installation.

Quality Assurance

URO backs this replacement crankcase breather hose with a 24-month unlimited mileage warranty. The molded AEM construction and guaranteed fitment support dependable service in the crankcase ventilation system.