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Why is my Fiesta making a knocking sound?

My 2008 Ford Fiesta has started making a knocking noise at the back, next to the exhaust. My local garage has replaced the box, but the nose persists. Any idea why this is?

Asked on 13 April 2014 by CAZZY 13

Answered by Honest John
Part of the exhaust system being struck by part of the suspension on compression. Re-setting the exhaust will solve it.

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