The Lincoln LS is a mid-size, rear-wheel drive executive sedan which was available from Ford's Lincoln Motor Company division from 1999 until 2006. Some model years of the Lincoln LS have keyless entry remote fob smart keys that are onboard programmable, which means a person can program the keyless entry remote fob smart key with no special equipment other than the keyless entry remote fob smart key programming instructions. However, other model years of the Lincoln LSare not onboard programmable and require special equipment in order to program the keyless entry remote fob smart key.