How To

How to use an OBD2 scanner step by step: find the port, key on engine off, read stored and pending codes, save freeze frame, check readiness, then clear safely.

OBD2 scanner vehicle coverage explained: what every 1996+ car supports, what varies by make, and how to check a scanner's coverage list before you buy.

Readiness monitors and smog checks explained: how many incomplete monitors each model year may have, why monitors reset, and how to check before you test.