Most tire pressure sensors are built into the valve stems in the wheel.
The send a signal to a reciver on the vehicle to monitor tire pressure
tire size and presure are always on a sticker on drivers door or drivers door post.
On a 2007 Ford Explorer : ( NO ) the spare tire does not a sensor for the Tire Pressure Monitoring System ( TPMS )
About £77 for the sensor plus time to fit and re-program, about another £60
It's to let you know if the tire pressure sensor monitor is working or not. This is the sensor that let's you know if you tire pressure is low
Check the tire pressure requirements for you car in the owner's manual. Then check actual tire presure for all wheels. If it's wrong, pump tires to appropriate pressure and check the sensor again. If the light didn't come off, you have to call the dealer.
In the valve stems
is the tire presure in a honda dirt bike 230 crf
It should be on a sticker on the driver's door jam. That is the manufactures recommended tire pressure.
pull passanger tire
Its stamped on the sidewall of your tire. Each manufacturer are different p.s.i
under the spare tire mounted to the frame
You can reset by resetting ECU but the light will come back. You need to fill tires to proper pressure. If you did, make sure that the spare has proper pressure too. Spare has air pressure sensor, it will set off the light if it is too low.