Well I brought the vehicle to the dealership yesterday. In short there is no issue found with the car.
They connected the Z to their computer and checked all stats while the car was driven and at idle. Everything came back in check.
However...Some interesting information I would like to share...they were able to replicate my concern where the intake temps were high & rising with the car in the on position, engine off...The advisor who is a Z specialist as well as a Z owner himself tells me that he was not 100% sure but he has heard of heating elements inside of these sensors. I did not get a definitive answer whether the Z has this but he was leaning towards that as a possibility. Turns out my $12 OBD2 and Torque pro app are in fact very very accurate...
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