Underbody Flapping Noise

AHall · 08-05-2023, 05:17 PM

Hello,

Has anyone experienced a flapping noise that seems to come from under the car in the area of below the front passenger? My wife has a 2018 M550i purchased new with no modifications. The sound started maybe a month ago. The sound only occurs at high speeds (around 60 mph). I am guessing something is loose under the car, but when I look under the car all the panels seem to be in place and secure.

jsf721 · 08-06-2023, 07:41 AM

I bet one of the Acess panels is missing an attachment clip or bolt.

Warp Ten · 08-06-2023, 10:22 AM

Quote:

Originally Posted by jsf721

I bet one of the Acess panels is missing an attachment clip or bolt.

I have from time to time found myself following a vehicle down the road with a clearly visible underbody panel flapping. Usually an older Toyota or the like. Lazy mechanics who worked on it. --Bob

AHall · 08-26-2023, 07:43 AM

Hello, circling back to this after car was taken to the dealership for diagnosis. Turns out a cross member bolt was loose. Probably when they replaced a front strut, they did not properly tighten the bolt.

08-05-2023, 05:17 PM	#1
AHall Lieutenant Colonel 982 Rep 1,797 Posts Drives: 1993 Nissan 240sx Join Date: Oct 2008 Location: Frisco, Texas iTrader: (0)	Underbody Flapping Noise Hello, Has anyone experienced a flapping noise that seems to come from under the car in the area of below the front passenger? My wife has a 2018 M550i purchased new with no modifications. The sound started maybe a month ago. The sound only occurs at high speeds (around 60 mph). I am guessing something is loose under the car, but when I look under the car all the panels seem to be in place and secure.
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08-06-2023, 07:41 AM	#2
jsf721 Captain 1111 Rep 869 Posts Drives: 2019 540i X M Sport Join Date: May 2019 Location: Long Island, NY iTrader: (0)	I bet one of the Acess panels is missing an attachment clip or bolt.
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08-26-2023, 07:43 AM	#4
AHall Lieutenant Colonel 982 Rep 1,797 Posts Drives: 1993 Nissan 240sx Join Date: Oct 2008 Location: Frisco, Texas iTrader: (0)	Hello, circling back to this after car was taken to the dealership for diagnosis. Turns out a cross member bolt was loose. Probably when they replaced a front strut, they did not properly tighten the bolt.
	Appreciate 0 Quote