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My wifes car was doing the same thing. Found out it was a bad gas cap. I was also told that if you fill the gas tank with the engine running you can have the light go on too. The computer runs a pressure test every 10 minutes and if it runs when cap is off light will come on. The thing like Mike said about the dealer is a lot of the times the way to go. They deal with brand of car frequently and may be easier for them to chase down problems that they probably have seem before.
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