So from what I can gather you have replaced the temperature sensor just after the air box. I would now go ahead and replace the one on the Intake manifold as shown in attachment. The only other thing I would suggest is to reinstall the CIA to see if the code is still there.
Sensor Intake Air.jpg
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.
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