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1. Should strut be replaced when the strut bearing is replaced and, if so, why? on 2004 Lexus ES330

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The above auto has been driven only 55,000 miles. The sound is exactly as describe on your website. Can hear the knocking noise when driving over bumpy surfaces. A dealer recommended replacing both sides strut bearings and struts. Makes no sense if other side is okay.
(1) Answer
I had a similar problem. It was a loose bolt in the left front strut tower. Dealer retorqued the bolt and the problem was fixed.