P0430 is
Porsche Fault Code 45 cat conv. efficiency bank 2
It does seem other problems can trigger this code.
Look at my thread here
http://986forum.com/forums/performance-technical-chat/55611-trying-wrap-my-head-around-fault-code-p0430-p0420.html
I'm still waiting to get my car back from the body shop to see if the new knock sensors will stop the P0430 code.