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Hi, the best thing to do is to find shop that has smoke machine, this machine works 100% in finding small leaks.
Not EGR valve.
Am I looking for a for a leak in the EVAP system?
Yes sir, that is correct.
Do many shops have a smoke machine? Is there another common method for finding a leak?
HERE are the conditions for code P0440 and P0441
Disregard first image, please
I do not think many shops have it, but you can get phone book and call arround.