TPMS, or Tire Pressure Monitoring System, is an electronic system used to monitor the air pressure in most modern vehicles. It lets you know if your tires are underinflated or overinflated, which could lead to unnecessary tire damage in the future.

There are two types of TPMS, direct and indirect:

  1. In a direct system, there are 3 different ways manufacturers determine air pressure:

    • The first is a sensor banded inside the wheel. Banded sensors cannot be serviced, but they can be reset.
    • The second is a sensor that comes assembled onto the wheel using a rubber seal, washer, valve core and securing nut. This type is serviceable.
    • The third is a sensor held in place by the valve stem itself. This type is serviceable, and it should actually be replaced on all new tires.
  2. Indirect systems measure the overall diameter of a tire, rather than the actual air pressure to determine if it is overinflated or underinflated. For example, an overinflated tire is larger in diameter. Therefore, it takes less revolutions per mile, while an underinflated tire is smaller and takes more revolutions per mile. The vehicle’s onboard computer calculates the measurements and then triggers a light on the dash when the results show the tire is overinflated or underinflated more than it should be. While indirect TPMS cannot be serviced, Chabill’s can reset these systems when tires are rotated, repaired or replaced.

At Chabill’s Tire & Auto Service, whether direct or indirect, a TPMS reset comes standard with every tire purchase to ensure your tires are starting out in the proper manner. If your vehicle uses the second direct TPMS system, ask about our rebuild kit, which includes a new rubber seal, washer, securing nut, valve core and valve stem cap. Not sure which type of TPMS your vehicle has? Just ask your Chabill’s technician.

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