ros

hi there I have a R reg 2.3 ghia galaxy, i only had 1 key when i brought it privrate, the key will not open remotely it will sometimes open all doors whenthe key in the drivers door but mostly only opens the drivers door, i've notice that the red light on the door stays on , i looked in the manual it says its a malfyction, is this a big problen or is it that the key needs to be recoded. kind regards ros