i need some help wiht my car. my ABS light is on. it's been on and off for a couple of month but since yesterday it is on full time.. I took the car to the dealer and they scan the car and told me i have problem with the "right rear wheel speed sensor". they freaking charge me $114 for it and now i have to replace the sensor that will cost me another $100+. i just had a 80000 mile major service done that cost me $400 plz..i need to save some money. is the sensor easily replaceable? if it is can i do it myself?