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Exhaust noise on start up


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Hi folks,

Hoping for a friendly steer on this one. Just purchased a 2017 520d M-Sport touring. Almost every time I start it, after a few seconds there is a louder high pitched rumbling noise coming from the exhaust. It lasts for about 5 - 10 seconds and the stops and it does happen occasionally after that but never when driving on a long run. This is happening daily. I have attached a video which I took a few seconds after I pushed ignition from cold one morning. The car drives great but this is annoying and not something I ever experienced with a 2015 520d I owned up to a few years ago. I have it booked into a local garage next week.

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Thanks, just thought it odd that it only lasts for a a few seconds at a time, hopefully the garage can resolve and nothing too serious. I did see a topic from a few years ago pointing towards DPF regens but no-one seemed to find a solution to those noise issues.

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  • 2 weeks later...
  • 3 weeks later...

Warranty garage having great difficulty finding any 'damaged' part or air leak so therefore I may have a fight on my hands to get anything replaced under warranty. 

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