While Autozone and other places like Autozone may offer a free code reading assist, we offer a more advance consultation. 
Our advance diagnotics tools can read live data and can actuate test.
Matco Maxflex advanced diagnostic tool 
Alldata Advanced diagnotic tool 
We utilize software from snap on (Mithell1) and Alldata for our standard operating procedures when making repairs. Inquire about purchasing a standard operating procedure.