Ok, like some folks have discussed extensively, I got the TPMS light on the dash this past weekend went to my local mechanic yesterday who used a Autel TS401 but could not read any of the sensors using the Crossfire but when used MB was able to see but not communicate with them. So is this a case of the receiver gone bad, or the case if I understand correctly that the sensors are transmitting on both frequency but that the TS401 may only be reading on one frequency vs both?