The Nissan Sentra is a compact car produced by automaker Nissan Motors and is generally a rebadged export version of the Japanese Nissan Sunny. Early model years of the Nissan Sentra 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, newer model years are not onboard programmable and require special equipment in order to program the keyless entry remote fob smart key.