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EL-50448 Tire Pressure Monitor Sensor TPMS Activation Tool used for GM vehicles equipped with a 315 or 433 MHz Tire Pressure MonitoRing SyStems (TPMS). This inexpensive and reliable Tool is durable and simple to use for "Sensor Re-Learn Procedure". The “Sensor Re-Learn Procedure” which must be performed:After tire rotationsAfter replacement of Remote Control Door Lock Receiver ModuLeafter replacement of Tire Pressure Sensor. Works on all General Motors brands and pRoducts manufactured for the North American market. It may not work on afTermarket TPMS sensors that have a different frequency.