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A control arm and ball joint assembly on your Ford Focus includes the ball joint, bushings, and the control arm. The control arms allow the wheels of your Focus to move up and down but prevent forward and backward or side-to-side motion in the suspension. Your Focus may use control arms with built-in ball joints that must be replaced as a single unit if either part should fail. If the control arm, control arm bushings, or ball joint should fail, they can compromise handling, comfort, and can result in the separation of the control arm and steering knuckle, which could be dangerous. As the control arm and ball joint assembly fails on your Focus, you may notice clunking when turning or going over bumps, drifting steering, or groaning noises when driving at lower speeds. If you suspect that the control arms, suspension bushings, ball joints, or other parts may be failing, inspect and repair them as quickly as possible. O'Reilly Auto Parts carries control arm and ball joint assemblies for your Ford Focus so you can make a complete repair.