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They'll tell you what the code is, and give you a print out in store...
No need to make more work out of it by borrowing (which they probably won't let you) the reader, then coming home and finding the code.
But, often times it's an emissions related problem over most problems. The ECU regularly runs test on the car, and if it fails a test it throws the check engine light. Then it will test the specific problem over and over, and if it passes the test (X) amount of times, it will go out. But, even if things are in check, it can take a week or two of driving to get rid of the trouble code. You can have them clear the codes at a parts store probably, and just see if it comes back on.
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Lets see how far it can go
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