Originally Posted by TL Jonesy
... Since it has been getting cold at night every morning the Low tire pressure warning light is on and read 4-5 psi low. The tires are supposedly filled with nitrogen according to the dealership.
...Any ideas on why this is happening or if it is actually normal with nitrogen?
1) Put some air in your tires when they are still cold-- at least to factory recommendations if not higher. Don't trust the gauge on the air pump, either-- use your own gauge or the TPMS.
2) Air is affected by temperatures more than pure nitrogen. Unless the dealership vacuumed out all the air from the tires before putting in nitrogen, the tires will have mostly air in them, topped off with nitrogen.
Air = 78% nitrogen, by the way, so I wouldn't pay for nitrogen/Nitrofill, etc.
Welcome to AZ.