Both shops are mistaken because the o2 sensors aft of the cats only sniff for emissions and don't affect mixture trims. I would disconnect the batt again for one minute to reset the DME and see what you get. Is it possible you crossed the pos/neg terminals and fried your DME?
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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