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Yes
When you replace the battery and remove power, all sorts of computers lose their memory and the car has to be run for a while for them to learn enough to reset. It is possible that running the car with the base parameters triggered the CEL and that after you have run for a while and reset the CEL, you'll never see it again. OTOH, it is possible something completely unconnected with this sequence occurred.
Get the codes read by an OBDII reader. Post here or look them up on the net via a search function on any of the Boxster forums. You'll know more then.
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