If yours was made in 1991 and sold in 1992, you may have just missed it.
On-Board Diagnostic (OBD) systems are integrated into the computers of new vehicles to monitor emissions controls. The first generation of OBD requirements were implemented in California in 1988 and were required on all 1991 and newer vehicles.
US: On Board Diagnostics ' Transport Policy - TransportPolicy ...
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https://www.google.com/search?q=1992+geo+metro+OBD+location
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