PCV Valve

The Audi PCV valve, officially known as the engine crankcase vent valve, is an integral part of your vehicle's emission control system. Its primary function is to regulate the pressure within the engine's crankcase. By allowing built-up gases to vent back into the intake manifold, these gases are then re-burned during the combustion process, significantly reducing harmful emissions released into the atmosphere. Beyond emission control, this valve plays a vital role in maintaining engine health and performance. It helps prevent oil contamination by managing the blow-by gases that escape the combustion chamber, ensuring proper lubrication and preventing sludge buildup that can lead to serious engine damage over time. Symptoms of a failing PCV valve can include rough idling, engine misfires, increased oil consumption, and visible oil leaks from seals and gaskets due to excessive crankcase pressure. This particular PCV valve, with OE part number 079103464D, is designed for specific Audi and Volkswagen models. It is installed on the engine side of the vehicle.