Item Name: Diagnostic Tools Car Tire Pressure Monitor Sensor Relearn Tool TPMS Reset Tool. Voltage:12VMaterial: high plastic & metalHardware Version: OEC-T5OBD Interface: OBDIISoftware Version: EL-50448Supported System: TPMSPower: 9WDescription:Most of vehicles equipped with a 315 or 433 MHz (TPMS) Tire Pressure Monitoring system, a "Sensor Re-Learn Procedure" must be performed after tire rotations, Remote Control Door Lock Receiver Module replacement or Tire Pressure Sensor replacement. This re-learn procedure can be performed by using EL-50448 special tire pressure tool. EL-50448 instructions:EL50448 works on all General Motors (for Buick, for Cadillac, for Chevrolet, for GMC) products manufactured for the North American market. It won't work if you've purchased aftermarket sensors that are the wrong frequency. EL50448 fit for G.M most kind of vehicles, equipped with a 315 or 433 MHz Tire Pressure Monitoring (TPM) system. This re-learn procedure can be performed by using special tool EL-50448. When do you need relearn tool?1.New TPMS sensors installed, letting air out or adding air in to the tire couldnt make the system recognize new sensors.2.Do tire rotation, didnt have a quick and easy way to let ECU relearn new tire information.3.When tire pressure indicator light ON, after the maintenance performed, the tire pressure needs to be reset to turn off the TPMS light.4.Low tire pressure or leakage /replacement or installation of tire pressure monitoring equipment / tire replacement, sensor damage, etc. After those problems solved, TPMS needs to be reset.5.Exchanging the winter tires or Summer tires. How to set your car in TPMS relearn mode?1. Make the gear in P position.2. Use cruise to choose TPMS re-learn mode in the dashboard settings.3. Horn will ring twice and the TPMS indicator flashes, then the learning mode has been successfully entered. (If equipped, the message center will display the front left (LF) tire)4. Before tire pressure monitoring system works normally properly, the body control module will record ID information of each position in the tire pressure sensor. How to use EL-50448 relearn tool?Step 1Set the car into TPMS re-learn mode. (Car will horn twice)Step 2Start from left-front tire, hold unit next to Valve and Press White Button, the horn bleeps once.Step 3Follow this order to reset TPMS one by one: front-right, rear-right, rear-left tires.After all sensors reset, the car horns twice means TPMS re-learn finished. Please Kindly Note:The package does not include the charger and battery. Package Included:1 x EL-50448 tool Note:1.Please allow 1-2cm error due to manual measurement.