Modern vehicles are rolling computers, with systems managed by embedded hardware and software designed to talk to the manufacturers’ diagnostic tools locally and wirelessly. While this complexity can make repairs more difficult for some home mechanics, every car sold in the United States since 1996 and in Europe since 2001 comes equipped with a connector known as an OBD-II (Onboard Diagnostics 2) port that gives the manufacturer, independent car care professionals, and the owner -– with proper equipment -–
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