ive had this error once about a month or two ago. but only ever came on once.. (I assumed it was because I park my car on my drive which is on a slope?)

however the last day or so this error has been coming on more and more.. is there something I can check or faults/ errors or something I can test on the car and physically see if I have a issue with the suspension before taking it to a garage (as im skint atm) any help appreciated

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2005 E53 X5 post facelift