Well, the answer is look at the most recent work done on the car.
I am in Phoenix also and could listen to your car if you like --- or refer you to an excellent Porsche Indy shop to diagnose the problem - depending you location in the Valley.
I agree with Jimmy about the plug connectors being loose - that is a good starting point.
Keep the car? Of course!! this is probably a minor fix --- BUT, also agree NOT good to drive the Boxster until the CEL is resolved.
Send an Email if you would like my help -- I'm retired and have some experience with these cars -- also have a Durametric analyzer.
Take care,
Ed
AKA Roy Turner, Arizona-Ed, Sboxin etc...
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