Otay Test and Repair on Main Street in Chula Vista holds STAR certification from the California Bureau of Automotive Repair, qualifying the station to inspect vehicles flagged as gross polluters or directed to test-only facilities by the state. The BAR-97 emissions analyzer and OBD-II protocol cover gasoline vehicles from 1976 to current model year, and the repair side diagnoses and corrects catalytic-converter efficiency codes, oxygen-sensor faults, and evaporative-system leaks that cause smog-check failures—a test-and-repair scope that complements the general-service focus at nearby Superior Automotive Repair. California requires biennial smog certification for most gasoline vehicles, and STAR-directed inspections account for the highest-risk segment of that compliance pipeline. The station also handles change-of-ownership smog checks required within 90 days of private-party vehicle sales, a transaction volume that intensifies around model-year turnover when dealers including Chula Vista Ford move trade-in inventory into the secondary market. Evaporative-system smoke testing with nitrogen-trace gas identifies pinhole leaks in EVAP purge valves, charcoal canisters, and fuel-tank vent lines that trigger P0440-series DTCs during the OBD-II portion of the smog inspection.