Tire Pressure

Originally Posted by Division

I took my first decent road trip this weekend- about 1/3 of the way back home the TPMS light started flashing and stayed on. After stopping and kicking the tires, checking for nails, etc... I found a walmart and grabbed a Pressure gauge. (new car- didn't have one in it) I was quite surprised to find out how over inflated the tires were. I guess the TPMS system measures the pressure differential between all tires, and not the exact tire pressure.

The LF was the closest at 37 psi, all other tires were between 42-43 PSI. I got home and let the tires cool down overnight, and they were still ~5 psi above the 35 psi spec on the door jam. I brought all the tires down to 35 psi and let them sit overnight again. Checked again before I left for work this morning, all are still spot on. Guess the factory/port/dealer should invest in a decent tire gauge.