same thing as me also, the cold, these sensors are really sensitive but i don't' pay attention to them. I check my tire pressure every week or so just in case.

 

I've had to have a couple of the sensors replaced. Mine would come on and not go off. I check my pressure every weekend and it's never been low.

 

Might be a sensor problem. My tire pressure light was on driving my car off the dealer lot. They said it would go away, but it didn't. Tire Pressure in all tires were fine. I had to deflate my tire and reinflate it for the light to go off. What do you know, it happened again. Getting it checked next week. Don't let them Bullcrap you.

 

oxygen has to much moisture that makes it has less air in the tire. i heard nitrogen well stop that problem

 

To clarify your post, air (like other gases) will hold moisture in the form of humidity. This can make it more susceptible to pressure changes due to temperature. Nitrogen can fix it simply because it is typically dehumidified out of the tank. However, I've had both and can tell you there's no appreciable difference.

 

Boyle's Law. Temperature is inversely proportional to pressure in a closed system (such as a tire) so when it is cold, add air. Rule of thumb is about 1 psi per 10 degree drop in a tire.

 

I just had my G in for it's 15k check and it had an issue with the TPMS. If the TP light is flashing at startup, you have a sensor/system issue. If it's on constant, check your pressure.

-- Lou

 

Any light flashing at startup is perfectly fine. But if you have an issue with the TPMS it will either turn on, or it will turn on for 2 seconds, off for 0.2 seconds, and keep repeating. If it's a single TPMS sensor, it will blink in sequences.