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Typically it's something emission related. You could have an upstream or downstream o2 sensor on the fritz, could be a cylinder misfire that popped up and went away. When you check the codes report back.
I've driven cars with the CEL on knowing that it was a P0420 code. I got tired of looking at the light on my Taurus and finally replaced the catalytic converter that was pretty much shot. My Subie, I tried to fix the problem a few times and just gave up. It didn't hurt mileage or performance so it became a mind over matter thing, if I don't mind, it don't matter.
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Nick
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