Hi!
First, you chose the wrong section of the forum: Classifieds is used for advertisements. Your request for help is unlikely to be noticed here. You should've posted it in the
main model discussion section (and no, it's not really populated now so you could try technically close models of 2, 3, 4 Series "F" designation forums for more of knowing/experienced audience).
Regarding your issue. If your other (spare) key fob works fine I would suggest you take the battery from it and put it into the fob in question. If it fails to work still it must be faulty. The message you keep receiving actually means the fob's signal is weak: make sure it's not being blocked by anything (like using it from inside an RFID protected purse
).