The tire pressure light keep coming on after I put air in them. .what's the problem

SOURCE: lexus ls430 2004 tire pressure indicator

Veve713:
You probably didn't need new tires unless you had some miles on it. Remember that the spare tire also has a pressure monitor as well. It most likely is causing the low tire pressure light on the dash and only needs to be inflated back to what ever your other tires are set to. I had the same problem on my RX and took it back to the dealership where they told me since the spare is exposed to the same elements (it's under the back of the RX - you have to use the tire iron to let the spare down), it will inevidably lose air.

Good luck.

MDGolfHacker

SOURCE: lexus ls430 2004 tire pressure indicator

Contrary to popular belief the indicator light does not reset itself. Once you put in the proper tire pressure in all tires including the spare you must reset the indicator light. The reset button is located on the driver side underneath the dash panel. Stick your on the break pedal, turn and look up. You will see the reset button. With th engine on and park break on,push and hold te button for 5 seconds. The indicator light will turn off and you are all set.

SOURCE: low tire pressure light won't stay off after proper reset.

Some newer Toyota vehicles have a sensor in the spare tire. Tires loose air over time naturally. I would check out the spare.
When did this TPS light start coming on?
Have you had new tires put on, or had a flat repair done before the light?

SOURCE: the check tire pressure light and ABS auto

The tire pressure monitor detects any changes in the tire inflation pressure. Therefore, it must initialize and store it in its memory if the tires or wheels have been replaced, re-inflated or the tires have been rotated. You should be able to re-initialize the system by following these steps:

1. check and make sure that your tires are inflated to the correct pressure

2. turn the ignition switch to the ON position. If the low tire pressure warning light comes on, push and hold the tire pressure warning reset switch (think the switch is in the glovebox, but not sure) until the warning light turns off and then release the switch.

3. now press and hold the tire pressure warning reset switch until the low tire pressure warning light blinks three times.

4. initialization is *not* completed until driving at the vehicle speed of 19 mph or over for more than one hour. the tire pressure monitoring starts when initialization is completed.

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SOURCE: tire pressure light stays on after putting air in

35psi is the correct pressure.

To reset the tire pressure monitor system, after correcting the problem, you have to use the options under the Driver Information Center (DIC) on your dash. The button you want to utilize is called the "set/reset" button, it is the third button from the left, directly in the middle of all the buttons. It has an arrow that points to the left. Press and hold the button until the DIC displays "Tire Inflation Has Been Set", this message confirms the tire pressure system has been reset. If, by chance, the DIC does not return to the standard display with the date, ect., you can press the "options" button to get back to the standard display. The "options" button is directly to the right of the "set/reset" button you just got done using. It has a lower case "i" on it.