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Thanks, Flatrater. I really appreciate your help.
The dealer said it holds a vacuum and they did a pressure test to 10psi. The service manager said a smoke test was also done. I thought he was pulling my leg.
I asked if there was a sensor in the tank and they said it was reading the correct pressure. They thought if it was the sensor, it was an intermittent problem. But, the gas cap message stays on all the time. Sometimes the check engine light comes on, but its usually just the gas cap message on the display center. There was one time that the message and engine light both went off while the engine was running, and was fine for a few days.
When the computer gets cleared, there are no problems for a few days, then it comes back.
I'm thinking of going to another shop, but hate to pay another diagnostic fee just to hear the same thing. I have some ideas now, thanks!
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