The car will throw P0113 just for unplugging the MAF, even if the key is off. Make sure you give it a couple key cycles to go away. When it read -40 it means it is seeing an open circuit (could be bad, but could also just be unplugged).
-Geoff
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'12 2SS RS Convertible - Traded in.
'16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold!
'23 2SS Convertible -Same as above except orange.
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