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My engine doesn't run smoothly (like a misfire) when accelerating at hwy speeds, especially when the outside temp is above 20 degrees... the warmer the temps are, the worse it is.

I have a code P0431 - "warm up cat efficiency below threshold (Bank 2)"

Is it an O2 sensor problem, and if so, which one is it and what is the Hyundai p/n for the sensor? Bank 2 is in the front, correct?:confused:
 

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Yes, bank 2 is in front. For part #s and possible other helpful info; click on "search this forum" using key words: O2 sensor part numbers. Should take you to a number of threads concerning issues such as yours. Thread #2 by Gabmando titled "Puzzled by Scanner: Code P0431". Final post on thread will provide source on part numbers.
 
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