On any car if you get a check engine light or other fault light this typically means one or more of the sensors has failed or has a faulty connection.
The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage
The best way to repair is to send the car to your nearest Audi service center for checks as they have the necessary tools and equipment to diagnose your car.
Best bet
Would really need more details on the vehicle. Petrol / diesel etc
Is the engine management light on? Are there any fault codes?
Power lose while driving is most likely to be caused by the mass air flow meter, leak at a vacuum or intake hose, turbo leak etc.
More details please........
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