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Question: check engine light on- but problem was fixed

Question- Is that difficult for them to figure out? I'm already going to be $100 in the hole for them to run another diagnostic. My car is having problems starting- but runs okay. In the morning- great. Quick stop to get gas before work- doesn't want to turn over. Leave it alone for 15-20 minutes only a little hesitation.

Background- A month ago the light came on and the diagnostic read vacuum seal had a problem. They fixed it, two days ago the light came on and I took it to an auto shop store for the testing (vs $95 at the dealer) and it said the vacuum seal had a problem. They just fixed it so the guy turned it off. Came back on two days later and a friend of mine took it to someone who has a diagnostic machine and gave me a free diagnostic- yep, vacuum seal problem. He looked at it for 30 minutes and said there was no problem and that the sensor was bad and needed to be replaced.