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Last year on my 2004 986 the OBD Fusion app showed all monitors ready and no fault codes. When I took it to my local ‘goto’ tire store for NYS inspection it passed safety but failed OBD emissions with a “car could not communicate with NYS emissions testing center”. Drove immediately to our Audi dealer in the next town over and it passed no problem. Some kind of variance in either my tire store’s testing system or their comm line. Don’t know if this relates to your problem, but it does happen.
If all your OBD monitors are showing ready, I don’t know what else might be the problem. Good luck!
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Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . .
The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice 
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