Hi,
Having read the below comments, i too am beginning the slow elimination process of finding out exactly what is going on here.
I have a Cooper s
Jcw (2004 53 plate), indeed every now and then the
DSC , ABS and even Runflat lights ping up every now and then.
Now if im running along at speed, i excercise caution and only do it on a clear straight, but turn off the engine and restart, this then clears all 3 lights for a period of time

I took the car to BMW and they diagnosed a faulty Wheel speed sensor, F/N/S. They siad they'd messed with it and that i would now work for an unknown period of time. The replacement will cost £33 from German Swiss French auto parts (uk) i can fit it myself if needed.
Nothing went wrong with the car then for about a week, but the lights then came on once when turning hard left only....This led me to consider the possibility that this is the Steering angle sensor people keep making reference to???
To be honest, im not bothered what it is, im looking at selling the car now, i just want it fixed! however if i sell it back to bmw i aint telling them sqwat....
Also worth of not is the gearbox rattlt i had last year which goes when you press the clutch.....
This appears to be a clutch kit replacement ...Not a new gearbox/flywheel which ive had replaced 3 times in 12 months which never resolved the issue..
Happy motoring guys and let me know what you think on this left turn issue?
Many Thanks
Charles