 Break out your scan tool. You know, it's funny what you can do with a scan tool. You don't necessarily think of using a scan tool, a diagnostic scan tool, as part of a no-crank diagnosis. But vehicles as far back as 25 years ago, if you go in under year-make model, meaning that scan tools today are OBD2, onboard diagnostics level 2, federal emission controls, where they're looking at emissions-related information.