I have a 99 accent gl. it has a check engine light that i got read and it said the speed sensor had no out put. the symptoms of the car is the car doesn't want to shift to the right gear. it feels like the car gets stuck in third and wont change. I can get the part for 45 bucks but i wanna know how hard it is to change or if i should have some one else do it for me. Because there is no repair manual out yet for the car i dont know what to do. Any information or pictures of what i would be looking for would be a great help.