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Hi, I have a three month old GLC 220d (3000 miles) which has developed a knocking noise when under power between 1500 and 2000 revs. Mercedes think they fixed it by re-fixing an "air pipe" but I can still hear the noise. Worse when the engine is cold but still there even when warm. Anyone else having similar issues.
Thanks
Geoff.
 

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It might help to take it to a different dealer since not all of them will take the right course of action, and not all tech's are built the same, some have more knowledge than others and some shops are overall run better than others.

Which Mercedes dealer did you end up going to?
 

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this is awesome features in car.
 
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