Tire Pressure?

My 2000 Toyota Sienna is running very well. But I have one problem with the Tire Pressure indicator. When I drive more than 50 miles at Freeway speeds, the indicator just lits up. But when I check the tire pressure, it is just company prescribed pressure. I have mentioned this to the dealership when I take my van for regular service. But I guess the problem I had mentioned to the service attendant is not exactly explained to the mechanic. They check everything and say things are looking ok electrically. But the problem still exist. Also, after the light lits up after 50 miles, if I stop and switch off my vehicle for few minutes then proceed, the pressure indicator lits up within 20 to 30 miles or so. Longer the time I stop, longer the light stays off, but 50 miles is max. I am now used to ignore this light whenever I travel far. Does anyone have any idea about this?

Thanks
Sathish

Hmm I belive that your tire pressure might be uneven?
If your tire pressure is a bit high or bit low light might come up also one of your tire might have a slow leak.
Hope this helps

Does this have anything to do with Sienna's engine oil sludge problem?

Hi, recently the low tire pressure warning light of my Sienna comes ON everytime after driving about half a mile, I checked all tires pressure are correct. Is there any expert can help me to solve this problem. Thanks in advance.

If your tires are within the recommended air pressure, there may be a problem with the sensors.
There really is no quick fix for this, as it could be a safety issue. Have the computer diagnosed by a dealer. Hope this helps. Larry

Hi Larry, any idea where the sensors are Located?