| If your tire pressure sticker is missing from your driver's door jamb, your Dealer should be able to replace it.
A large temperature drop could account for several pounds of pressure loss in all tires and set off your TPM (think it will respond to a 3 pound drop).
The additional loss on your passenger front tire would be something beyond temperature and would be more than enough to trip the warning by itself.
It could be a small 'puncture' in that tire that only leaks when that tire is parked in a certain orientation, but should be repaired anyway.
Especially with 'Run-Flat' tires; the TPMS system is needed to provide warning for a 'low' tyre that could be damaged by running at a pressure that would not be obvious by 'look' or 'kick', also just a couple pound difference could affect your braking and handling adversely. | 
