In What Year Was On-board Diagnostics II Obdii Systems Enacted Nationwide?

In What Year Was On-board Diagnostics II Obdii Systems Enacted Nationwide? 1996 — OBD-II becomes mandatory for all cars manufactured in the United States. What year did OBD 2 come out? OBD2 was introduced on all 1996 and newer model year passenger cars and light trucks sold in the United States. However, early versions of