What does a clicking sound near the front end of a Hyundai Sonata indicate?

A clicking sound coming from the front end indicates there is something wrong with the axle on that side of the front end and that it might fail. When the clicking sound becomes very audible, have the axle checked. It might cost about $250 to replace the axle. The "axle" is not the type of axle that goes all the way across the car from one wheel to the other. It is only a joint between the front wheel on that side and the steering mechanism.