Audi VW Crankcase Vent Valve - Hengst AS371M05

Product Information

The engine crankcase vent valve, also referred to as the PCV (Positive Crankcase Ventilation) valve, is part of a vehicle’s emission control system. It helps manage the pressure inside the engine’s crankcase by allowing gases that build up in the crankcase to be vented back into the intake manifold. These gases are then burned in the combustion process, reducing harmful emissions. The PCV valve also prevents oil contamination and helps maintain proper engine performance by controlling the amount of blow-by gases (unburned fuel and air mixture) escaping from the combustion chamber.

• Rough Idle or Engine Misfire: A faulty or clogged PCV valve can cause the air-fuel mixture in the engine to become unbalanced, leading to rough idling or even engine misfires, especially when the car is idling.
• Oil Consumption: A faulty vent valve can cause pressure to build up inside the crankcase, which may push oil out through seals or gaskets, resulting in oil leaks. Excessive pressure can also force oil into the intake manifold, leading to increased oil consumption.
• Sludge Buildup: If the valve is stuck closed or blocked, the blow-by gases can’t escape the crankcase properly. This can cause condensation and oil to mix, forming sludge inside the engine. This sludge can block oil passages, leading to lubrication issues and engine damage over time.

About Hengst

Hengst Filtration is a family-owned company founded in Münster, Westphalia, in 1958. With more than 3,600 employees at 25 locations worldwide, Hengst develops innovative solutions in filtration and fluid management.

Hengst supplies technologically leading filtration systems in the fields of plant and mechanical engineering, industrial filtration, hydraulics, Life Science, and Health Care. Hengst's customized solutions are used in medical cleanrooms, air conditioning systems, cleaning equipment, industrial plants, power tools, and robots. Hengst is also a series supplier to the international vehicle and engine industry and a development partner for sustainable drive and mobility concepts.

Hengst Filtration thus makes future-oriented technologies possible in all industries worldwide. The Hengst brand has stood for top quality in filtration for 65 years. Initially known as "H-Filter for oil, fuel, and air", we have been developing and manufacturing filtration and fluid management solutions for renowned automotive and engine manufacturers since the very beginning. Hengst is now a recognized brand for many areas of application in the automotive industry.

Hengst develops innovative solutions for well-known manufacturers and therefore also stands for OEM quality in the service parts sector. This means you can rely on Hengst solutions for the entire life of the product.