regarding the tpms sensors,. if they are aftermarket you need to use the drb to start the learn process then use a tire pressure sensor reading tool to read the sensor. reading the sensor with the tool activates the aftermarket sensor just like applying the magnet does to the stock sensor. so use the drb3, start the learn process and read the l/f sensor with the aftermarket tire pressure sensor read tool, the drb will beep and say go to the p/f tire, repeat the process for the remaining 3 tires.