Probably a bad wheel-speed sensor (there are 4 of them).

 

I will look into it, as I gathered from the other posts. My concern is the jerk--seems something might be wrong mechanically, unless it's the limited rear slip diff coming on. Any thoughts?

Also, I cannot for my life find the part number of the wheel-speed sensor, on RealOem.com or PelicanParts. Is it the same thing as ABS rotational sensor?

 

Part of the function of the DSC is to direct more or less braking force to one particular wheel in a hard, fast turn....a bad sensor could possibly cause one brake to be applied heavily at the wrong time, causing a swerving condition. Only "M" cars have limited slip diffs...all others use a manipulation of the ABS/DSC system.

 

+1 top Bob's advice. Another possible culprit is a low battery. All kinds of wierd things can happen. Go have the free test done at an auto parts store, can't hurt.

 

im with fast bob on this one. a wheel speed sensor going wacky makes the most since. you should have a dtc in the dsc computer if that is the case. i don't know of any aftermarket scanners that can communicate with dsc module. may have to get a dealer scanner hooked up to it.

 

Many thanks guys. Will check my battery at Autozone and then take off the wheels and clean sensors when I change the oil. For some reason, the DSC issue went away recently...will post update on how things go.

 

Please help!! I have a 02 325i with a 112,000 miles just got it a week ago an my abs light brake light engine light an traction control lights stay on constantly no weird jerks or anything just annoys me to death I do need brakes so that could be the reason for the brake light an my engine light says my cars running to lean so I took it to a local shop an was told to replace my pcv An CCv system and my valve cover but I'm still puzzled about my abs and traction control lights ;(! Love love the car it's beautiful and I want to keep it. Please help!!