if you cant find a dirty or loose wire to a hub or a loose hub, aka jacked up pushing and puling the top of the tire if it has play it likely bad.

if you cant find any of these things its best to just pay to have it scanned at a shop, it beats tossing money at it with out knowing if it will work or not.

do hit a few shops and ask how much. i had shops that wanted 100, 80, 75, the last guy was 40, so i let him scan it.