Probably one of the wheel speed sensor wires got cut/unplugged. Also possible one failed, or is just messed up. I don't know it the Subarus are optical or magnetic. The former can get dirty, the later can get build up.
Did the scan tell you which corner it is? If it doesn't say which corner, I guess it could be an actual speed sensor on the tranny or diff, but I wouldn't think so.
__________________
I am a Commodore PET --- Now get off my lawn you kids...
|