I dont know about your car but mine did the same thing when the weather changed last year and started to get hot out. It threw a few codes randomly but the car was running perfectly fine. When my opti went it never threw a code at all, just ran like crap. I have a feeling my PCM was on its way out though when it started throwing random codes out, but when i got it tuned it took a crap on me anyway and got a new PCM and never had the problem since. I would say if its running fine let it be and see if it happens again, if it does and comes up with the same code do as Tsar said and replace the cheaper parts first.
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