Welcome! Glad you're doing some healthy reading.

Quote Originally Posted by deamwilliams View Post
change my speed sensor on my own (since it isn't working after getting my tires/brakes checked)
I am inclined to believe that you wound up with some neanderthal mechanic that left your sensors unplugged for some reason. Might be worthwhile to pull the wheel off and check that all is plugged in before you start ordering parts.

Plug should look like this... #1.