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On the BMW 330ci (model years 2001 and up), one common problem is the front control arm bushings. The control arm bushing is round, about 3 inches in diameter, and sits in a metal retaining bracket, which has two bolt holes. The bushing can be seen under the vehicle, near the front tire. The central rubber portion of the bushing wears out over time, and if broken, will cause vibration and clunking or knocking noise. The bushings are usually sold as a set (one for left, one for the right) because it's best to replace both at the same time. Price range is approximately $130-160 for a set of two. Another differential diagnosis (although NOT as common a problem as the front control arm bushings) is the front CV axle assembly. A worn CV joint can cause clicking or clunking sounds especially when making a turn.

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