DSC? abs etc etc lites
 

i recently had to replace left knuckle on my 02 X5 4.4i while knuc. was off i did ball joint,tie rod, upper an lower control arm bushings, changed out speed sensor! now my DSC lite comes on at 30 mph!! does anybody have any idea what could b up? any help would b great!!

Have you scanned it for error codes?

yes the only codes i got was P0141 and P0492 air flow prob

You need a scanner that can scan BMW ABS and DSC modules. A generic scanner won't do that.