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Or take your car in and tell them the CEL flipped on and have them run a diagnostic check with their computer. I would follow them and if they do anything other than whip out a ruggadized calculator with a big connector on it tell them its alright.
They should have a handheld device that allows them to check for codes.
Obviously you haven't had a CEL on so it will come up with nothing. IF they charge you don't take it to them. . .if they don't its a pretty good chance they aren't out to cheat you. Some will charge you just for an estimate on how much it costs.
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