You ID the car, activate the sensors , retrieve the data, plug the TS501 or TS601 into the vehicle OBD port and it goes straight to the module that is responsible for the TPMS on the vehicle , just follow the menu and it edits the tire sensor positions on the vehicle without having to get a scanner, find the proper module on the vehicle and then have to type in the new positions using the scanner. TS 601 has a generic OBD2 scanner built right into it to pull codes besides TPMS functions