To remove the 2009 ford taurus headlight assembly, watch: https://www.youtube.com/watchv=gachjjcftr0 being able to see at night is important for driving down the road. your lights need to be working or you may get into a wreck. some issues will show up at some point. corrosion is very terrible to deal with. a faulty wire might come about. lights could burn out prematurely. blown fuse can come about. a failed relay equals a failed light source. these issues need to be dealt with quickly. the light bulbs will stop working eventually. if it becomes dull, you will have to replace them. they aren't that expensive, so they won't hurt your bank account.
The 2009 ford taurus headlight assembly removal can be found online.