--- title: "Clean Truck Check Testers in San Francisco, CA (7 listed)" description: "Find 7 CARB-credentialed Clean Truck Check testers in San Francisco, San Francisco County: 7 offer mobile testing, 1 do smoke opacity tests. Phone numbers…" url: "https://ctcfinder.com/testers/san-francisco-county/san-francisco/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in San Francisco, CA 7 testing businesses in San Francisco (San Francisco County) are on CARB's public Clean Truck Check tester list (9 credentialed testers). 7 offer mobile testing, 1 do smoke opacity tests, 4 test motorhomes. > CTC Finder is an independent directory, not affiliated with CARB. Tester data: CARB Clean Truck Check public tester list, last checked November 1, 2026. Confirm services, hours and prices with the tester. ## Testers in San Francisco - **[Dogpatch Biofuels](https://ctcfinder.com/tester/dogpatch-biofuels-san-francisco/)** — San Francisco, CA 94107 — (415) 505-6517. Services: mobile testing, OBD testing. - **[Auto Express Tow](https://ctcfinder.com/tester/auto-express-tow-san-francisco/)** — 270 Napoleon St, San Francisco, CA 94124 — (415) 407-8977. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Bay Area Mobile](https://ctcfinder.com/tester/bay-area-mobile-san-francisco/)** — 1245 Van Dyke Ave, San Francisco, CA 94124 — (415) 716-4175. Services: mobile testing, OBD testing. - **[Castro Smog Station](https://ctcfinder.com/tester/castro-smog-station-san-francisco/)** — 376 Castro St, San Francisco, CA 94114 — (415) 254-5896. Services: mobile testing, OBD testing, motorhome testing. - **[GTC Clean Truck Check](https://ctcfinder.com/tester/gtc-clean-truck-check-san-francisco/)** — 2910 Griffith St, San Francisco, CA 94124 — (415) 225-8362. Services: mobile testing, OBD testing. - **[Jose Garcia](https://ctcfinder.com/tester/jose-garcia-san-francisco/)** — San Francisco, CA 94118 — (617) 953-5630. Services: mobile testing, OBD testing, motorhome testing. - **[Mobile Golden State Emissions San Francisco](https://ctcfinder.com/tester/mobile-golden-state-emissions-san-francisco-san-francisco/)** — 355 Berry St., San Francisco, CA 94158 — (925) 818-1831. Services: mobile testing, OBD testing, motorhome testing. ## More testers within 20 miles - **[A1 Mobile Clean Truck Check LLC](https://ctcfinder.com/tester/a1-mobile-clean-truck-check-llc-brisbane/)** — 350 Glen Park Way, Brisbane, CA 94005 — (415) 806-9121 — 4 mi. Services: mobile testing, OBD testing, motorhome testing. - **[B and A Bodyworks Towing INC](https://ctcfinder.com/tester/b-and-a-bodyworks-towing-inc-daly-city/)** — 454 Talbert St, Daly City, CA 94014 — (415) 793-4887 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Diesel Check Emission Testing](https://ctcfinder.com/tester/diesel-check-emission-testing-daly-city/)** — 6844 Mission St #401, Daly City, CA 94014 — (415) 756-5465 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Heavy Auto Health](https://ctcfinder.com/tester/heavy-auto-health-daly-city/)** — 355 Rio Verde St, Daly City, CA 94014 — (415) 439-9369 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Valid Huseynli](https://ctcfinder.com/tester/valid-huseynli-daly-city/)** — Daly City, CA 94015 — (206) 605-7576 — 6 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Mobile Golden State Emissions Testing South City](https://ctcfinder.com/tester/mobile-golden-state-emissions-testing-south-city-south-san-francisco/)** — 988 El Camino Real, South San Francisco, CA 94080 — (925) 354-4370 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Steve Eftimiou](https://ctcfinder.com/tester/steve-eftimiou-south-san-francisco/)** — South San Francisco, CA 94080 — (415) 716-3119 — 7 mi. Services: OBD testing, smoke opacity (non-OBD) testing. - **[Steve Skrivanek](https://ctcfinder.com/tester/steve-skrivanek-south-san-francisco/)** — South San Francisco, CA 94080 — (650) 333-0475 — 7 mi. Services: OBD testing, smoke opacity (non-OBD) testing. - **[Steven's Bay Area Diesel](https://ctcfinder.com/tester/stevens-bay-area-diesel-south-san-francisco/)** — 480 Littlefield Ave, South San Francisco, CA 94080 — (650) 290-3703 — 7 mi. Services: OBD testing, smoke opacity (non-OBD) testing. - **[Truck N go](https://ctcfinder.com/tester/truck-n-go-south-san-francisco/)** — 861 Stonegate Dr, South San Francisco, CA 94080 — (925) 482-7108 — 7 mi. Services: mobile testing, OBD testing. - **[Alfred Saroni IV](https://ctcfinder.com/tester/alfred-saroni-iv-oakland/)** — Oakland, CA 94607 — (510) 336-4015 — 7 mi. Services: mobile testing, OBD testing. - **[Mobi Mech Diesel Tech](https://ctcfinder.com/tester/mobi-mech-diesel-tech-oakland/)** — 1122 Wood St, Oakland, CA 94607 — (510) 708-4040 — 7 mi. Services: mobile testing, OBD testing. ## Cost Typical published prices in California: OBD test $50–$135 per vehicle; smoke opacity test $190–$200. Prices are set by each tester. ## Frequently asked questions ### How many Clean Truck Check testers are in San Francisco? CTC Finder lists 7 testing businesses in San Francisco from CARB's public tester list (9 credentialed testers), last checked November 1, 2026. Listing on CARB's list is optional, so the real number can be higher. ### Is there mobile Clean Truck Check testing in San Francisco? Yes. 7 listed businesses in San Francisco offer mobile testing, which means the tester comes to your yard. Use the Mobile filter above to see them. ### How much does a Clean Truck Check test cost in San Francisco? Testers set their own prices. Published prices for an OBD test are usually $50–$135 per vehicle; smoke opacity tests for older trucks often cost more, and mobile testers may add a trip fee. See the [cost guide](https://ctcfinder.com/guide/cost/). ### How often does my truck need a Clean Truck Check test? Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). ## Nearby cities - [Daly City](https://ctcfinder.com/testers/san-mateo-county/daly-city/) — 4 listings, 5 mi - [South San Francisco](https://ctcfinder.com/testers/san-mateo-county/south-san-francisco/) — 5 listings, 7 mi - [San Bruno](https://ctcfinder.com/testers/san-mateo-county/san-bruno/) — 4 listings, 9 mi - [Oakland](https://ctcfinder.com/testers/alameda-county/oakland/) — 15 listings, 9 mi - [Richmond](https://ctcfinder.com/testers/contra-costa-county/richmond/) — 3 listings, 14 mi - [San Leandro](https://ctcfinder.com/testers/alameda-county/san-leandro/) — 8 listings, 14 mi - [San Mateo](https://ctcfinder.com/testers/san-mateo-county/san-mateo/) — 4 listings, 15 mi - [San Lorenzo](https://ctcfinder.com/testers/alameda-county/san-lorenzo/) — 3 listings, 16 mi - [San Pablo](https://ctcfinder.com/testers/contra-costa-county/san-pablo/) — 7 listings, 16 mi - [Hayward](https://ctcfinder.com/testers/alameda-county/hayward/) — 18 listings, 19 mi