Just got new winter tires. Had to replace a TPMS sensor a few months back and then had to replace another when the tires were put on. The light stays on and sometimes flashes when I drive. I have had the air pressure checked and it is perfect, no air leaks.
Mechanic tried to reset it and was unable... We even unplugged the battery for over five minutes and it STILL is on.
Toyota's usually have a long relearn procedure on new sensors. They need to get the I.D. number off the new TPMS sensor and reprogram it into the computer, then reinitialize it. Higher end diagnostic scanners can do it. If not, you will have to take it to the dealer.
My TPMS light (2012 xB) came on. Several months after getting new tires. Tire air pressure is OK. The light went out after several days but a month later, it's on again. Any way to reset it? I don't know why it came on, went off, or came back on. The owners manual says take it to the dealer. That sounds like a lot of money....
There is a reset button under the dash to the left side. You press and hold it for 5 seconds. There are a couple possibilities for why the light is coming on. You could be having pressure fluctuations due to temperature changes or you might have a sensor that is going bad or has a battery that is dying. i wouldn't both with going to the dealer if the reset button doesn't work. Any competent tire shop will have the tools to diagnose and fix whatever the problem is. If it's sensor going bad you can order new ones off of Ebay inexpensively. I just put a spare set in my 20s so I wouldn't have to pull my 18s apart to get the stock one out.