Any update on this? I currently having the same issue. Under normal throttle the car is driving fine. Once you give full throttle I get low power and the half yellow check engine light come on. I have a Sears OBD11 reader but, it tells me I have no error codes. Not sure if the Sears tool can read BMW codes If I restart the car the check engine light goes away until I go full throttle again. I've had all the fuel pumps, injectors and sensors replaced about a two years ago. It so strange just happen out of the blue.
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