Dan,
Go to here for essential documentation:
http://www.digital-kaos.co.uk/forums/f104/porsche-poses-2-42-install-cd-46838/
I couldn't get the system to install, but once the zip archives are unzipped, you can save all the English (EN) pdf's that are OBD2 related which contain troubleshooting information for all the codes -- stop searching in the dark and wasting your time!!!
BTW, don't ever clean a MAF sensor with soap/water -- CRC makes a spray cleaner for MAFs.
Regards,
paul