May be a stupid question but can a scan tool like snap-on scan tool permentaly delete codes such as for the egr and air or is an actual "tune" needed for that minor detail. I have full access to everything but a tune around here in central Missouri.

 

i'd like to know as well. my air failed and i'm tired of looking at the SES light

 

No, it wont. Sorry,

IT will only erase them until the fault has been seen again.