Mazda 3 2011: Knocking sound

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My 2011 Mazda 3 suddenly developed a knocking sound in December, which sounds like it is coming from the back passenger side of the car. The noise is intermittent and it does not matter what the speed or the road surface. It's driving me crazy, but the dealership can't seem to find the cause. I would be very grateful for any suggestions.

Answered by CarsGuide

8 March 2013

Graham Smith

First check for anything that might have come loose under the car and knocking against another component. If there's nothing you can see then have the shock absorbers and the mountings checked.

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