2009 997.1 TT CEL fault code C1604 Evaporative Emissions
 

2009 997.1 TT, Durametric gives me this fault code: C1604 Evaporative Emissions (very small leak). Could not find anywhere on the site (or web for that matter) that talks definitively about what this code means, but I am thinking it is the charcoal canister. Hate taking it to the dealer, but I think this is probably covered under the factory emissions warranty.

Thoughts?