Gates EMH903 Engine Crankcase Vent Valve

Gates EMH903 Crankcase Vent Valve

The Gates EMH903 crankcase vent valve is an OE-exact pressure regulator for the emission control system. It is built for direct replacement on select Audi and Volkswagen applications, with the correct plastic construction and hose connection sizing for a precise fit.

For drivers searching for a crankcase vent valve for Audi S4, Audi A6 Quattro, or Volkswagen Touareg applications, this Gates part number EMH903 helps restore proper crankcase ventilation performance and serviceability.

Key Features

• OE-exact crankcase ventilation pressure regulator
• Plastic housing for application-specific fitment
• Two hose connectors for the listed vehicle connections
• Inside diameters: 14 mm (.554 in) and 15 mm (.571 in)
• Direct replacement for emission control crankcase ventilation service
• Gates EMH903 part number for easy identification

Product Details

This Gates crankcase vent valve is part of the brand’s Crankcase Vent Valve line, focused on exact-fit emission ventilation components. The EMH903 is engineered to match the original configuration used on the listed Audi and Volkswagen models, helping maintain proper crankcase pressure regulation and ventilation routing. If you need a replacement crankcase vent valve for Audi A8 Quattro, Audi S8, or Volkswagen Phaeton applications, this part is built around the specified hose sizes and connector layout.

This part cross-references Standard Ignition V465 for the same application.

What It Helps Address

• Crankcase pressure regulation faults
• Oil vapor ventilation routing issues
• Emission system performance concerns tied to the PCV circuit
• Vacuum-related drivability symptoms from a worn vent valve
• Fitment problems caused by incorrect hose connector sizing

Installation Notes and Tips

Verify the hose connector diameters and connector count against the original part before installation. Confirm vehicle application by year, make, and model, especially on Audi A6 Quattro, Audi S4, and Volkswagen Touareg listings. Inspect adjoining hoses and seals during replacement so the new valve can operate with the rest of the crankcase ventilation system as intended.

Quality Assurance

Gates supplies OE-exact crankcase ventilation components designed to restore the emission ventilation system to proper operation and performance levels. The EMH903 is built for direct-fit replacement and consistent service life in the listed applications.

Compatible Vehicles

• Fits 2004-2009 Audi S4, N/A
• Fits 2002-2006 Audi A6 Quattro, N/A
• Fits 2000 Audi A6 Quattro, N/A
• Fits 2000-2006 Audi A8 Quattro, N/A
• Fits 2004-2006 Volkswagen Phaeton, N/A
• Fits 2004-2006 Volkswagen Touareg, N/A
• Fits 2001-2003 Audi S8, N/A
• Fits 2002 Audi S6, N/A
• Fits 2002 Volkswagen Passat, N/A