I took my Spark (2014 5spd) on it's first road trip of 200 miles, and the TPMS symbol (!) started flashing for about a minute and then stay illuminated for about 10 minutes, then went off. it did this once on the way back as well. i have the stock rims/tires on it, and all tires are 42psi. i read that if it "flashes" THEN stays on, it's a problem with the actual sensor. so i'm planning on taking the car in to have it checked out. it only has 1000 miles on it so i'm shocked i'm already having issues. lol. i had a Hyundai Accent before for 4 years and not a single issue with that car. Ha