Newer cars have a TPMS and warn you when the pressure gets low. Now
that cold weather is here,check to see that your tire is at least the
recommended pressure. I forgot about it and this morning it was 7
degrees. One tire was 1 pound under and set off the warning. It would
not reset after driving as it had to come up even more than driving did.
Not a major deal as I knew the pressure was adequate, but it annoys me
to have that yellow light on when driving. I understand this is a
common happening for the first really cold snap.