Evaporation system problem on '05 Pontiac Vibe on 2005 Pontiac Vibe

My check engine light came on recently and my mechanic said it was a problem with the evaporation system so he replaced the vent cellinoid (sp?) and put on a new gas cap. The check engine light is back on again and I'm wondering if anyone has had the same problem and what the issue might be.

2 answers 3 comments
I'm having the same issue with my 2007 pontaic vibe. Did u figure out what it was?
Yes, they replaced the canister vent valve. I couldn't find it on this site but they charged me $289. The work was done last week and so far, so good.
The car needs to be scanned again to make sure what the issue is this time. It could be something else or another issue with the EVAP system.
Thanks. I plan to take it back to the mechanic tomorrow. I have noticed and continue to notice a slight smell when the heat is on, so I don't think the replaced vent selonoid addressed the issue.
Possibly not, just needs what you are planning. post results if anything else is needed.