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Hi, I’ve noticed a rattle coming from inside my 2018 A4. Seems to be coming from either inside the rear shelf or maybe from the brake light? Only occurs when driving on less than smooth surfaces. Anyone else got this issue?
 

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My car doesn't have any rattles, but it's 3 years newer. Maybe it just hasn't had the chance to develop one yet LOL. I can say my previous A4 was a 2010, and it didn't have any rattles either. For me, having a rattle destroys the driving experience. And I might as well be driving my old '78 Chevy 3/4 ton truck down a wash boarded gravel road. I hope you figure it out soon.
 

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Rust and corrosion also cause the deterioration of the exhaust system itself, which can cause rattles. In instances like this, the muffler or tailpipe probably needs to be replaced. Sometimes, an exhaust system clamp gets loose, creating a rattle. Another cause of rattles under the car is a failing catalytic converter.
 
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