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depends on how often you check tire pressures. you could over time be loosing air by it leaking out around the tire bead, or the tires hitting a curb or pot hole that can cause air to leak, a dirty rim may need to be cleaned or someone is keeping the pressures the same that is noted on the decal on the drivers door jam. I trust you have used a good tire gage and not just looking at the tires, as there is more weight on the front tires than the rear and the front will look like they are lower in pressure.
ALL YOU HAVE TO DO IS INFLATE THE TIRE TO THE RIGHT AIR PRESSURE AND DRIVE THE VAN IT WILL RESET ON IT'S OWN, IF THE TIRE PRESSURE IS SET AND THE LIGHT IS STILL ON THAN CHANCES ARE THE BAN THAT SENDS THE SIGNAL TO THE COMPUTER IN SIDE THE TIRE IS BROKEN. IF YOU HIT A POT HOLE OR BANG THE TIRE AROUND TO MUCH IT WILL BRAKE, BUT DOUBLE CHECK THE PRESSURE FIRST. HOPE THIS HELPS.
the sensor in the tire may be faulty. If you have taken it and checked the air pressure in the tires already and it stays on then you probably have a faulty sensor. try airing the tire up a little more and see if it goes out. If not you may need to go to the dealer. They should be able to connect to the computer and verify the faulty sensor. Did you air up all the tires? Some systems will only tell you a tire is low and not which tire it is so air them all up too!
Firestone Hmmmmmm. Well the reset button is located just under the dash to the left of the steering column, hold for a few seconds and the light should go out. Hopefuly the firestone tech won't tell you your brakes need greasing the next time you go in for service, haha. Oh, I do beleive your tire pressure should be 29 psi. But, you can check your owners manual for correct pressures. It sould also tell you where the reset button is also. That should FixYa good luck.
Sound's like you have a bad tire. There are steel belt's in the tire that help keep there shap, but when one belt's break you have flat spot that make's it seam like your driving over pot holes. Before you go off changing the tire have it balanced first to see if that is the real problem. Good luck.