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Registered
Join Date: May 2002
Location: Santa Barbara, CA
Posts: 4,821
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See here where the blue arrow points. Sometimes the access hole is covered with a blue plastic cover. You can pull that cover out with a sharp pointed tool. If the cover is gone you should get to it with the AFM in the car.
The screw is 3mm or 4mm HEX socket - don't remember on top of my head.
(curtesy of FRWilke) 
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430
I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!!
How about a NoBadDays DualChip for 964 or '95 993
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