Tire light information I had originally posted this on CT thought it was good info.
There are 2 different types of tire pressure warning systems on Toyotas, one has the regular rubber valve stems which these use the wheel speed sensors on each wheel for ABS to calculate the rotation of the tire as the tire get lower the speed of the tire changes causing the low tire light to come on, The other system has metal valve stems and these have the sensors inside of each rim, depending on what model you may have one in the spare or not, the trucks usually have all five and like the new Camrys they only have four sensors,They calculate tire pressure and temperature and are wireless and send a signal to a computer mounted inside the center of the vehicle. Not all of the metal valve stem type have a reset button under the drivers dash or steering column , the ones that do not will reset themselves after the vehicle is started, I have found that you should run a little higher pressure than normal because they will kick a light on at 26 to 28 psi and you know how tire pressures go up and down with temperature and another thing is checking tires hot they will be higher and than when they cool down they will be lower. If all your tire pressures are good let's say 38 psi and you've reset your tire pressure light if you have one and the light comes back on than the problem may be in the sensor itself and you will have to use a scan tool to verify this. All the metal stem type are coded with different ID numbers and have to be programmed by a scan tool so you can not take one set of tires with sensors and put on another vehicle because those sensors where not programmed to that vehicle. Sorry this is so long but a lot of people don't understand these systems and maybe this will help .
Note :If you have a reset button turn the key on and wait for the tire light to go off and then press and hold the tire light reset button until the light flashes 3 times and than release it should be reset.
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