The headlights on my 2010 Tacoma are yellowed and look bad. I got my oil changed at the dealership the other day and when I was signing paperwork and paying the bill, the fellow told me that my head lights are dull and yellow due to the bulb burning the plastic. They ordered all new everything at no cost due to a Toyota recall I knew nothing about. If you have a Tacoma with this problem, get it to a dealership and get your truck looking new again.
I have a 2010, but don't seem to have that problem. If you don't mind me asking, do you do a lot of night driving, and how many miles on the odometer.