Hi everyone, I new to this and hope yall can help. I have a 2014 dodge ram and the abs and slip lights are on and the 4x4 wont engage. I have looked on youtube and can't see to find a video that pinpoints the issue. Please help!

 

Probably a wheel sensor.

 

How many wheel sensors are there? And can I go to like autozone or O'Reillys for them to scan the truck and them tell me which one it is?

 

Also, what is the difference between a wheel sensor and a speed sensor? Could the speed sensor also cause it?