Ok, it looks like you have deleted that tire somehow and since I am not an EEZ TPMS expert, I "suspect" you will probably have to relearn that wheel/tire position and its associated EEZ sensor back into the system. It is best to refer to the attached video on UTube for that whole process.....but I think you should only need to re-enter the missing wheel/tire position by going into the program mode first as if you were starting the whole process and stepping to the missing position with +/- buttons. Probably the global high and low settings you set originally would still be there (not sure) and you would have to just relearn the sensor code back into the monitor. Note the attached link advises that there is one sensor type that requires being on the tire in order for it to register with the monitor.....so you might have to leave it on the tire and take the monitor out to the wheel/tire to redo the registration process if you have that sensor type. Hope this is helpful.