Are check engine indicator problems common in Chrysler 300m's?

I just bought a 2000 chrysler 300m and the check engine light keeps popping on. I took it back like 3 times and each time they replaced something and the check engine indicator comes back on after a couple of days of driving. There really seems to be nothing wrong with the engine and a couple of people who are really good with cars have told me this too. Any opinions out there on Chrysler 300m's?
 
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