If it's a very rapid sound I describe as sounds like morse code that's usually anti sway bar link. If it's more of a thud but still rapid fire, is look into the sway bar mount itself.

I dunt remember if e70 shares the mount with the stiffening plate as does the e53 but most mechanics do not properly tighten the bolts when replacing the stiffening plate so that's often a source of problems.

If the sound is a loose shield of some type the sound will not be as reliable or consistent. Eg sometimes it will be silent on big bumps but also it will tend to repeat on bumps not dips or opposite.

If it happens on dips and bumps it's more often a suspension component.

Take an audio recording. Often somebody will have had the same problem and will recognize.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)