So on Saturday I put air in the tires and drove 400 miles round trip to Boston to Albany. Today, I drive back to Boston in an icy mix and about 60 miles in I get the low pressure light. Now I'm worried since I just aired up the tires 72 hours ago and never had a light. I stop at the next rest stop with intentions of checking the pressure. Damn, I didn't have a gauge in the car so I do a visual inspection, all looks good. As the drive goes east the temps go fro 25 to 45 and I was hoping the warmer temps would make the light go away. Nope. I ask my daughter to read the manual for me and it said to do a TPMS reset after airing the tires which I didn't do 72 hours ago. Off to the next rest area stop the car do the reset and the light goes out and never comes back on for the remaining 250 miles of the trip. At home, I check the pressures and they ranged from 32.5 to 34. Any ideas why I got a light at all? It was cold when I initially added air on Saturday. There was such little variance here but a lot of anguish since I didn't initially do the reset.