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"1. <strong>OBD1 is connected to the console of a car</strong>, while OBD2 is remotely connected to the vehicle. 2. OBD1 was used during the earlier years of the car manufacturing industry, while OBD2 was only introduced in car models produced in the early 1990s."
<https://www.engineeringchoice.com/how-to-use-diagnostic-car-code-reader/>