Can easily replace a good TPM. I tested new TPMs when they were still in the "box" and still wrapped in "plastic" with the VT31. Works normally and reads ID/Temperature/Pressure/Battery. Installation started. Raise vehicle, remove tire, remove valve core, break tire bead, remove old TPM, mount new TPM, inflate tire, mount tire, lower vehicle. Check TPMS with VT31 sensor WAS not detected. Raise vehicle, remove tire, remove valve insert, break tire bead, remove new tire pressure, check with VT31โฆ