What Is The OBD-II Port And What Is It Used For?

If you purchased a car after 1996, chances are it has an OBD-II (On-board diagnostics II) port. Every car or truck on the road manufactured after that point is mandated by United States Federal Law to have one installed. But what is it? OBD-II is a sort of computer which monitors emissions, mileage, speed, and other useful data. OBD-II is connected to the Check Engine light, which illuminates when the system detects a problem. Depending on the problem, the light either stays on, flashes, or goes away entirely. Mechanics can use scan tools to make sense of the diagnostic trouble...

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