Quote:
Originally Posted by Jittsl
Almost defiantly a vacuum leak. I've never done it but I believe you'll want to find someone to do a smoke test presuming you can't find an obvious leak (which I suspect is pretty damned hard in a Boxster).
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I think you're absolutely right... Here's some videos I found incase anyone else has these exact same codes...
Smoke testing for codes P0171 P0174 - YouTube
SMOKE WIZARD Finds Vacuum Leaks! 1-888-668-6080 - YouTube