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Check wheel bearings, swivel hub bearings, all tie rod ends, steering damper, radius arm bushes and wheel balance.
Get someone to swing the steering wheel back and forth while you're under the front of the car to check the tierod ends
for play.
Jack up the front of the car, try to wobble the wheels in and out, top to bottom and side to side to check for bearing
wear.
If it happened all of a sudden, check for thrown wheel weights.