So......... it happened AGAIN!!!!! This time, the tips broke off, not the nut down below. The stock TPMS sensors are complete garbage. I suggest everyone replace your own before you have a problem.
Tired looked a little low, so on lunch, I tried to take the caps off to test the air pressure. The tips of the TPMS sensor broke right off (tips = places you put air in from). Stupidly, I tried to take the cap off the front one and the tip broke off that one, too.
This is what I have left right now. I hope I don't go downstairs to my car and find two flat tires (already replace both sensors on the drivers side). Should have just replaced all 4.
Edit: Here are the pictures