The check engine light, epc light, and stability control system light illuminate on the dashboard. the engine goes into what could be described as safe mode. regardless of how far down you push on the accelerator, the vehicle will be slow to accelerate and at speeds at or above 75 mph may not accelerate or even maintain highway speed. i have taken my vehicle to two different audi dealerships. audi sent one technical field manager to inspect my vehicle. i have completed numerous repairs at the recommendation of the dealerships. none of the repairs have solved the issue.