I've gotten this twice, once yesterday, but only had to turn engine on and off. Nothing visibly outta whack, but that 20mm statement is concerning? Should I worry at this point? When the warning came on I noticed the suspension was different but after restart I drove over a 100 miles with no other issues since.

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Rockin' is my business and business is good!
2005 4.4 X5 Black/Black, the goods