Look what I've found in
X5 Dynamic Stability Control troubleshooting manual

ASC Engine Intervention

Engine torque may be reduced by:
• Reducing the throttle opening angle
• Retarding the ignition
• Canceling individual cylinders by fuel injection cutout.
The DSC III control unit determines the amount of torque reduction that is

necessary and sends the request for regulation to the DME via the CAN bus.

Could that cause power loss? because I have three beautiful yellow lights shining on my board for 5 months now. =)

anyway I will start a new thread about that

I was not aware that you had any warming lights on. If you have a eninge light, it would make sense to remedy that problem, as your symptoms are likely cause by these.

No I didnt mean the engine light. Its abs dsc and brake lights. could that cause a loss of power by engine intervention?

So you have 3 idiot lights on currently? The ABS, DSC and Brake lights are all lit?

yes. those three lights, which come up as I accelerate and stay till the engine is shut down. They dont appear as I start vechicle, only with acceleration and then stay for the whole trip. I think it might be a speed sensor (dont know which one) or module itself. not sure.