I had the same problem awhile ago, it turned out to be a switch malfunction on the secondary blower of the emmission system. The dealer fixed in about 1 hour and was aware of the problem as it has happened frequently. You should search the site as there is additional information on this problem and information on how to repair it yourself with the part needed.
I will say that the folks at the 1-800 number were extremely helpful and suggested the gas cap when this did not work told me to take it to the dealer, made a reservation at the dealer, and called me later to make sure that I made it to work.