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I have an Expy 2001 and the check engine light keeps coming on. Now I had this looked at 2 years ago and it was some sensor that went bad and now it's happening again. What is the correct fix? Is it possible that the same sensor keeps going bad?
Until you have your codes read, it is impossible for anyone to do anything more than guess as there are hundreds of fault codes, each with its own specific reason.
If you are near an AutoZone, stop by and get the codes read for free. WRITE DOWN THE EXACT FAULT CODES (not the lame description). Come back here and SEARCH for prior discussions using your fault code(s) as your SEARCH argument. Do NOT let the monkeys at the parts store try to diagnose the fault: If they knew how, they wouldn't be working there.....
If you get stuck (not just lazy) ask for more assistance.