Scan tool question

[GrandV6]

Can a scanmaster show in range numbers for all parameters & your car still have an exhaust or vacuum leak??
In other words is it possible to have a leak and scanmaster not pick it up.
Car has a TT chip

 

[TexasT]

I would have to think that the degree/size of the leak would have an affect on if scanmaster or other scan tools could pick it up. A smoke machine/generator tool to put smoke into the system would be a much better way to see about leaks. or it is it sealed to introduce air pressure and see about leakdown.
As far as vac leaks a squirt with carb cleaner and seeing about the idle speed change if any can find them. Exhaust leaks a smoke set up and visual inspection of the pipes will sus them out.