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The Positive Crankcase Ventilation (PCV) valve recirculates gases from the engine’s crankcase back into the intake manifold, reducing harmful emissions and preventing pressure buildup within the engine. A malfunctioning PCV valve can lead to excessive pressure, oil leaks, increased emissions, and potential engine performance issues such as rough idling or stalling. Regularly inspect the PCV valve for signs of blockage, wear, or malfunction, and replace it as needed according to your vehicle’s maintenance schedule, typically every 30,000 to 60,000 miles. Maintaining a healthy PCV valve ensures efficient emission control, reduces engine pressure, and maintains optimal engine performance.