Swing by an Autozone or Pep Boys and they'll use their OBC reader to give you some error codes, and possibly turn it off for you.
It can illuminate for a bunch of different reasons, but the most common ones have to do with the MAF or the 02 sensors from my personal experience and the posts from many, many other Boxster owners on this forum.
I hope you're successful getting it turned off permanently. It absolutely drives me bonkers when my CE light is on!
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