The fault you are getting means your Cam Tensioner has problems which it cannot compensate for by adjustment.
Driving your car with this error is inviting a major failure [sucking a valve].
I would not drive this car until you find a competent mechanic to evaluate your problem totally.
Short of running your Boxster without oil, there is not much worse then sucking a valve.
BTW - there is a TSB on this type of CEL.
What year is the Boxster.
I just noticed your name 911SC - do you remember the Carrera chain tensioner upgrade. This is telling you you are about to have one of those failures, if the CEL P code is dead on.
Scott
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