Vaccum Leak---> Always a CEL or No?

[USCTROJANSFIGHTON]

My SA mention that I loose vaccum line. I cant remember what the code was. I dont have any "Check Engine".
I have used Innova 3030 scanner. NO DTC
I have have used Torque lite. NO DTC
I have INPA/Ediabass...but it's in German...so I cant understand what its saying.


My question:
IF YOU HAVE A LOOSE Vaccum Line or Vac leak, would it ALWAYS SHOW CHECK ENGINE?

I am having 2nd thoughts...now.....

Thanks