A lack of reverse lights would certainly make me suspect a bad 'neutral safety switch' and 'range sensor' - since they are in the same assembly. Lack of license plate lights on my Escorts has been just bad ground connections (in my hatchback) and a bad wire at the upper hinge point (with my 92LX wagon). As far as I know the license lights are just connected to the running light circuits - not associated with the backup lights at all. Though a bad ground connection near the rear lights could affect both. If you are in a pick-n-pull, and if you can harvest a set of the license light lenses and sockets, it might be a good idea. They seem to corrode a lot. Be aware the lenses for the license light are not the same on wagons as on the hatchbacks. I dont know about the sedans.