Operating since 2009 as a STAR-certified Test Only station, Telegraph Canyon Smog in Chula Vista processes California emissions inspections from 501 Telegraph Canyon Road near the corridor connecting western Chula Vista to the Eastlake district. Fleet operators needing annual compliance certifications — rental agencies including EZ Car Rental and commercial van services — depend on the Test Only designation's unbiased pass/fail determination, which California law requires be independent of any subsequent repair. The station handles DMV-directed retests, gross polluter evaluations, and change-of-ownership inspections, accepting gasoline and diesel vehicles of all model years under California's BAR-OIS testing protocol. Drivers preparing vehicles for sale or trade-in pair the electronic smog certificate with a fresh detail at Super Star Car Wash on Palomar Street, a common pre-listing sequence that clears both the compliance and cosmetic steps in a single afternoon. The BAR-97 analyzer cross-references OBD-II readiness monitors against emission-threshold tables for hydrocarbons, carbon monoxide, and nitrogen oxides, flagging catalytic converter degradation and evaporative canister leaks before transmitting results to the state database.