ABS sensor/connection failure

I have my ABS light on, it's been on for a while so i thought I'd get an OBD scan. The scan came up with the result Left Front Wheel Speed Sensor Failure. So i replaced it, and the light is still on and refuses to clear (OBD scan reveals the same code LF sensor failure), if I clear it it comes back before i even leave my driveway (6 feet, if even that). The ABS computer does not respond when necessary either. Do i check the reluctor ring? Do i check the connections? Do i check the ABS computer?