Sometimes, if you get lucky, automotive diagnostics can be pretty easy. If a customer comes in with air hissing out of a nail hole in his tire, the diagnosis is going to be pretty fast and very positive:
There is a nail in the tire.
The nail is letting the air out of the tire.
If you remove the nail and patch the hole in the tire, the leak will be fixed, the air will stop coming out of the tire, the owner will be happy, and you will have a customer for life.
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