I am in the Nashville area, and the Temps have finally dropped. The local Discount Tire has a special line set up to add air because everyone is getting the tire light due to the air contracting due to lower temps. On there website it says its best to measure in the morning when the tires are cool and to add 2 lbs to the recommended when adding air in the afternoon and
an extra 6 lbs. if measuring after driving on the highway for a while.
https://tinyurl.com/y5txfvkk . That seem a bit extreme, I would just measure a tire that is not low and match what that number is.
On the sensors, I bought four on Amazon for my sons Nissan, said they were VDO and the light is back on after 2 years. Probably cheap knockoffs. So do not buy VDO there. On one of my other cars with OEM sensors ( Denso) tire warning just now flashed on and off on a recent trip and that car is 12 years old.