“P.C.V.” stands for “positive crankcase ventilation.” A P.C.V. valve is an integral part of the positive crankcase ventilation system (P.C.V.) system. It is also known as the crankcase ventilation system. The P.C.V. valve is a one-way valve attached to the crankcase of your car’s engine and removes unwanted gases from the crankcase. 

The P.C.V. valve performs the role of emission equipment and has several other benefits to a vehicle’s engine health. Ensuring the functionality of your P.C.V. valve is essential for your engine’s health. A bad P.C.V. valve on an internal combustion engine includes oil leaks, seal and gasket failures, high engine oil consumption, and whistling sounds.

Unlike changing your battery or oil, there is no particular time frame to replace your P.C.V. valve. However, they are subject to damage due to a lot of blow-by gases traveling through them which can sludge the valve up. Replacing the P.C.V. valve on most engines is simple to do. You can replace a damaged P.C.V. valve yourself or have a professional mechanic do that for you.