I have a 1998 dakota r/t extra cab,got check engine light for o2 sensors,replaced all 4! Also got the infamous abs/brake light,replaced speed sensor on rear..guess what? all lights on again! Same codes,what the f*** Any clues?

 

Check the connector on the speed sensor to make sure it didn't vibrate loose. I'd do the same with the o2 sensors. Other than that, maybe a bad sensor out of the box?