So the abs light won't turn off. I have replaced the rear abs sensor and the light is still on. What should I do next? Also once in a while when I start the truck the it will rev real high and the check engine light will flash. But when I tap the gas it idles down and engine light goes off what would that be? All help is greatly appreciated thank you!

 

Did you take it to the dealer? There are codes for ABS but cannot be read by the regular OBDII scan tool. I know there's suppose to be a speed sensor in the rear differential that seems to give issues in Fords.

I had issues with the ABS light flashing now and them, turn out to be a signal issue. They clean the battery ports (which one was pretty bad) and that clean the issue up.