Automotive DIYer needs a way to distinguish between minor check engine codes (like evaporative emissions) and serious ones without physically pulling the gas tank, and wants a dash-mounted OBD scanner that displays codes in real-time.

Existing OBD scanners require plugging in manually each time and many only show a generic 'check engine' light without differentiating code severity. There is no always-on dash-mounted scanner that auto-classifies codes as minor vs. critical.