i dont think that is true. its a fed regulation that all vehicles 2008 and up have tpms. at least thats what i was told at my dealer that i work at. all our 08's have them.

 

The TPMS monitors the differences in each tire. If differences are noted from to tire then the indicator light will illuminate.

 

Yup, just make sure all the tires are the same pressure and the light should go away after about 5-10 minutes of driving. Otherwise a sensor is broke.

 

i dont have tpms in mine, its an 07 x

 

?

Unless I missed something, the central TPMS module monitors the pressure in each tire to make sure they are within a prescribed range. I didn't know it compared each to the other to make sure that, even if all were in range, one wasn't different.

EDIT: My '08 JK Unlimited X has TPMS.

 

I thought it was somthing in the air valve's or stems.

I have the same light. Haven't bothered chaning em yet. Too much time and don't get to have my jeep for who knows how long, cause the stupid shop forgot to change em out. So when I get the time, they'll fix it for free.

Til then, is is stupid? Cause if I go low on a tire, I won't know???? I have 35"s. Been running em since december. HAHA .. so almost 5 months. Eeesshhh

 

Thanks everyone for your help. I drove around today, and after about 30min the light went away. I didnt even have to mess with anything, which is odd, because all day yesterday the light was on. Maybe it takes a while to reset.

 

also the light will come on in the cooler/cold mornigns before the tires are warmed up and the air expands..happens all the time on cars with these sensors.

 

It sounds like those things are very sensitive are are more trouble than they are worth. Probably better to check tires the old fashioned way instead of having a light screaming at you when the moon and stars are not aligned just right.

 

You can tell if you have sensors buy the valve stems. Sensor will have all metal stems regular valve stems have rubber. If one sensor is below the factory setting it will go off. If it's set at 35 and you have 35 in the tire when it gets cold it will go off till it expands. Thats why some dealers were putting nitrogen in them to keep them from fluctuating. They cost about $30 a piece [ so I was told ] some 07's have them most all 08's and all 09's will. If you buy tires on line you will need to either have them shipped not mounted or buy new ones from the seller. I like the ones in my other car because they tell you which tire is low and the air pressure. I don't care for the Jeep sensors