need some help

how important are these two things. i got these codes out of my ecu, and i was wondering how it affects the car in short and long run. Thanks for the help guys.

EVAP Canister purge control valve/soenoid valve circuit

EVAP Canister vent control valve

I really need some help with this one. My light won't turn off and I don't know how severe the problem is. Any help?....just some info is sufficient

Ask Daniel B. Martin (4th gen forum on http://forums.maxima.org)

thanks!