If you have dealer LOCK the RFH, it makes it impossible to steal. When the RFH is locked, you can not program any keys, EVER. the down side is, if you loose your keys, not only are you buying new keys, you are also buying new RFH. Have seen a couple times here where thieves tried to steal vehicle with locked RFH and couldn't. Had a couple where the thieves actually put vehicle in neutral and pushed down the street. The problem with that is in order for thieves to replace and program RFH, need to go to dealership and provide proof of ownership.