I'm sorry. I have no advice. I've seen the vacuum diagram, and know that when I throw a code so related I'm going to pull some parts, for access, and replace every one of those lines. Not costly, but a little time consuming.
The smarter minds around here sleep in (giving their brains a rest). Someone soon will chime in.
Best wishes on the outcome. Keep us posted.
Cheers!
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1998 Porsche Boxster
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