What can result from a malfunctioning PCV valve?

A malfunctioning PCV (Positive Crankcase Ventilation) valve can lead to significant issues within the engine's operation. When the PCV valve is not functioning correctly, it can cause excess pressure to build up in the crankcase. This pressure can push engine oil out of the gaskets and seals, resulting in oil leaks. Furthermore, a faulty PCV valve can disrupt the proper recycling of gases back into the intake manifold, leading to unburned fuel and increased emissions. This not only affects the environment but may also impact the engine's overall efficiency and performance.

By understanding the role of the PCV system, it becomes clear that its malfunction can indeed lead to oil leaks and elevated emissions, making this choice the correct response.