clapperc, it sounds like you have a problem with the transmitter/receiver and/or rest of the system, and NOT a bad sensor itself. You may need to have the diagnostic trouble codes for the system read and troubleshoot it.
I "think", meaning I don't know, the Commander has a TPMS system that does NOT need programming. i.e. you can replace a bad sensor and just drive a few miles and it will recognize the sensor and turn out the light. Provided you got the exact right sensor for your vehicle.
Replacing the sensor requires removing the tire, then remounting and balancing it.
The seals and stems on the sensors are replaceable, so you don't have to buy a whole new sensor for a damaged valve stem or leaking seal. You do have to remove the tire though.
The aftermarket has started to offer aftermarket TPMS sensors for less than the dealer specific TPMS sensor for you vehicle. These aftermarket sensors are programmable to mimic several different brands/manufacturers of sensors. i.e. a tire store only has to carry a couple of different types of sensors to be able to service hundreds of different vehicles. Even though the Commander doesn't require programming, if you use one of these aftermarket programmable sensor, the sensor itself would have to be programmed to mimic the Commander's specific sensor.
Of course, you can also get the aftermarket sensors online and pre-programmed for you specific vehicle. Johnsvt, if you have an autohobby shop in Guam, you could order one of these cheaper, pre-programmed sensors and install it yourself and it should work without any programming.
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