Power loss

[Simweller]

Hi guy can anyone help my a3 losing power I have noticed there is a pipe to the left of air box (connected) that is not connected to anything it is sucking air in I have tested to put sock over it to see if it changes but no change can anyone advise thank you in advance 

[Steve Q]

You need a diagnostic check to see if any fault codes flag up. 

Also what engine has the car got? 

Does it happen in certain weather or temperature conditions? 

Any warning lights on? 

Any recent other work done to the car?