What Is the OBD-II Port and What Is It Used For?

If you purchased a car built after 1996, it probably has an OBD-II port. But what is it for, and how do you diagnose errors with it?

Installation guide: Vehicle Data Device plugged into the OBD-II port – Device Help

What Is OBDII? History of On-board Diagnostics (OBD)

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OBD2 Connector Pinout, Details & Datasheet

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Handleiding Manual Best Mini Obd Ii Port 4g Lte Obd2 Gps 12v For Car Vehicle With Canbus Jl939 Diagnostic Function - Tool Parts - AliExpress