Hello, I have a 2002 Galant that recently had the service engine light turn on, out of warranty of course. I ran the codes and they are P0446-Evaporative Emission Control System Vent Control Circuit and P0455-Evaporative Emission Control System Leak Detected (gross leak)

Is this just a sensor or valve that I could replace my self or does this have to go to a mechanic. Thanks