You need it because GM convinced the government that our cars need it. Kinda like daylight driving lights and E85 fuel.

If you don't put it in, then you will have the flat tire light and any chime that might go with it. I assume there is a chime. The sensors are there for slow leaks so that you know about the leak before it goes flat. Like if you are driving long distance or at night. Then you can pull over in a safe or lit area to change the tire. Could also save the tire so it's just a patch job rather than a new tire.

$278 is too much for one tire sensor. See if you can get a single one from Sparks or maybe buy a full set from Sparks and then sell the others individually to others in the future with the same problem. Even the ones from Discount tire will work in there. But you have to get the dealer to program it in the computer.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI
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