I think i figured out the problem.
the sensor was telling me the tires were low they were: 35, 37, 40, 38,
it kept saying "low tire pressure"
I just had the oil changed and i "assumed" they "checked" the tires
so I did what you said and looked on the door panel and it says the pressure should be 40 psi while the truck has been sitting for a while.
So i added air up to 42 on all tires ( i used a manual gauge and it said 42)
so i looked in the truck at it said the pressures were all 38. I did not add any more air because I was afraid of a blow-out.
So i started driving. About 5 minutes of driving, the "low tire pressure" sensor went off but its still telling me that the pressures are still 38
Well, at least I dont have the sensor flashing at me all day long.
im still dumb-founded ( or maybe just dumb
Thank you all for your help