I know what you mean about time. There's also the inconvenience of being without the car while waiting for parts or an opportunity to work on the car.
My wife bought me a used Durametric for Christmas and I was able to scan the car myself. My fault codes were:
P0300: Porsche fault code 62 - misfire damaging to cat converter
P0304: Porsche fault code 66 - Cylinder 4 misfire damaging to cat converter
The CEL wasn't flashing, but I didn't want to drive it to my mechanic because of the message about damage to to the cat. So it was either flat bed it to the shop or as you say "play a hunch." I felt lucky - this time.
Good luck with your repair.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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