The PCV valve on a 2002 Chevy Cavalier is located on the
valve cover. It's a small, usually black, plastic valve. However, its precise location on the valve cover can vary slightly depending on the engine (2.2L or 2.4L). It's often near the back of the valve cover, but you'll need to visually inspect the valve cover to locate it. It will have a hose connected to it, usually a vacuum hose.
To be certain, you might want to consult a repair manual specific to your 2002 Chevy Cavalier's engine (2.2L or 2.4L) for a diagram. You can often find these online or at an auto parts store.
