My car smells like gas cause of excessive gas flw. What needs to be fixed.

I took it to autozone and got error P0402. Excessive exhaust flow. Something about a valve may be stuck open. So which one..EGR or EPV? Can they be fixed before being replaced or is taking to shop my best bet. Or maybe o-ring? I know nothing about cars as you can tell. Lol

Check the about 8" long tube running from the top of the fuel pressure regulator. It should be attached to the rear part of the valve cover on the passenger side. This may be the cause if it has some cracks in it. Otherwise, it is probably probably best to let a shop diagnose as it could be the EGR itself or the EGR pressure feedback sensor. Good luck!!