ATEQ VT55 Tire Pressure Monitoring System (TPMS) Sensor Relearn Training Magnet Required on some: Cadillac, Chevrolet (Chevy), Ford, Lincoln and Mercury vehicles (to name a few), ATEQ TPMS Relearn Training Magnet used for vehicles that require a magnet during the reset process ATEQs VT55 OBDII reprograms Asian or European vehicles (including Toyota, Honda, Nissan, Hyundai, Kia, Mitsubishi, etc) which do not feature a TPMS self reprogramming software.