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The 2006 Toyota Sienna OBD 2 port is on "lower edge of dash, left of steering column"
The 2006 Honda Accord OBD 2 port is under driver side dash next to kick panel
Under dash
The 2006 Toyota Corolla OBD 2 port is under dash at left, next to kick panel
The 2006 Chevrolet Aveo OBD 2 port is under driver side dash next to center console
The 2006 Honda Civic OBD 2 port is under driver side dash next to center console
The 2006 Honda Civic OBD 2 port is under driver side dash next to center console
The 2006 Mini Cooper OBD 2 port is under driver side dash next to kick panel
Some states test cars for pollution compliance by connecting a reader to the vehicle's OBD-II port. Your 1990 Corolla is exempt from OBD-II testing because you don't have an OBD-II port - they first came out in 2006.
The 2006 Dodge Caravan OBD 2 port is under driver side dash lower left instrument panel
The obd 1 port is next to the battery
The OBD port is under the dash on the driver side.