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Glad to hear you had a good result.
I went through the same thing with mine last year. After wasting money on different "quick fixes" I found the best procedure.
1. I take it to my Porsche specialist mechanic (non dealership though) who has the Porsche diagnostic computer. List of fault codes cost me $50, a small price to pay to take the guesswork out of diagnosing.
2. Buy parts online to get the best price. The only caveat here is make sure the Porsche part number is the same. I bought some O2 sensors from an online store from a guy who assured me they were correct. They weren't and I got stuck with them.
3. Self-install if possible, or else find a competent shop who are not too expensive by the hour and don't mind you supplying your own parts. (My Porsche specialists do this for me).
This seems to be the most efficient, simplest and least expensive long-run procedure.
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