--- title: "Clean Truck Check Testers in San Marcos, CA (4 listed)" description: "Find 4 CARB-credentialed Clean Truck Check testers in San Marcos, San Diego County: 4 offer mobile testing, 2 do smoke opacity tests. Phone numbers, services…" url: "https://ctcfinder.com/testers/san-diego-county/san-marcos/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in San Marcos, CA 4 testing businesses in San Marcos (San Diego County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 4 offer mobile testing, 2 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 Marcos - **[Carrillo Equipment Repair](https://ctcfinder.com/tester/carrillo-equipment-repair-san-marcos/)** — 3480 Linda Vista Dr, San Marcos, CA 92078 — (760) 685-1392. Services: mobile testing, OBD testing, motorhome testing. - **[Hollandia Dairy Inc SMarcos SDE](https://ctcfinder.com/tester/hollandia-dairy-inc-smarcos-sde-san-marcos/)** — 622 East Mission Road, San Marcos, CA 92069 — (562) 644-9251. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[kashif ahmed Official tester](https://ctcfinder.com/tester/kashif-ahmed-official-tester-san-marcos/)** — 1605 W Mission Rd Suite A, San Marcos, CA 92069 — (760) 580-9100. Services: mobile testing, OBD testing, motorhome testing. - **[Thomas Brouillette](https://ctcfinder.com/tester/thomas-brouillette-san-marcos/)** — San Marcos, CA 92078 — (760) 407-7906. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## More testers within 20 miles - **[BIT Pros Fire Services](https://ctcfinder.com/tester/bit-pros-fire-services-escondido/)** — 670 Opper St, Escondido, CA 92029 — (760) 839-2641 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[G&R Auto & Truck Repair](https://ctcfinder.com/tester/g-and-r-auto-and-truck-repair-escondido/)** — 1335 Simpson Way, Escondido, CA 92029 — (760) 644-3614 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[L-Care Corp.](https://ctcfinder.com/tester/l-care-corp-escondido/)** — 2235 Barham Dr, Escondido, CA 92029 — (619) 985-3909 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Diesel Pollution Solutions Inc](https://ctcfinder.com/tester/diesel-pollution-solutions-inc-escondido/)** — 906 Jana Pl, Escondido, CA 92026 — (760) 407-7285 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[DM Emissions Testing](https://ctcfinder.com/tester/dm-emissions-testing-escondido/)** — Escondido, CA 92026 — (760) 803-8903 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[North County Clean Truck Check](https://ctcfinder.com/tester/north-county-clean-truck-check-escondido/)** — 2243 Bent Tree Place, Escondido, CA 92026 — (760) 805-9356 — 5 mi. Services: mobile testing, OBD testing. - **[Rudy's Automotive Solutions (Mobile)](https://ctcfinder.com/tester/rudys-automotive-solutions-mobile-escondido/)** — Escondido, CA 92026 — (760) 783-3392 — 5 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Mobile wrench](https://ctcfinder.com/tester/mobile-wrench-vista/)** — 550 Collyn Street, Vista, CA 92083 — (760) 845-5397 — 6 mi. Services: mobile testing, OBD testing. - **[MS Auto & Smog](https://ctcfinder.com/tester/ms-auto-and-smog-vista/)** — 1415 S Santa Fe Ave, Vista, CA 92083 — (760) 623-5629 — 6 mi. Services: mobile testing, OBD testing. - **[North County Ford](https://ctcfinder.com/tester/north-county-ford-vista/)** — 450 W Vista Way, Vista, CA 92083 — (760) 827-9271 — 6 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Yovanni Maldonado](https://ctcfinder.com/tester/yovanni-maldonado-vista/)** — Vista, CA 92083 — (760) 224-4500 — 6 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Rollin Wrenches LLC](https://ctcfinder.com/tester/rollin-wrenches-llc-vista/)** — 1312 Morning Glory Lane, Vista, CA 92084 — (760) 518-4791 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## Trucking in San Marcos San Diego County includes the Otay Mesa border crossing, California's busiest commercial truck crossing at about one million trucks a year (GSA, 2022). ## 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 Marcos? CTC Finder lists 4 testing businesses in San Marcos from CARB's public tester list (4 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 Marcos? Yes. 4 listed businesses in San Marcos 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 Marcos? 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 - [Vista](https://ctcfinder.com/testers/san-diego-county/vista/) — 5 listings, 6 mi - [Escondido](https://ctcfinder.com/testers/san-diego-county/escondido/) — 13 listings, 6 mi - [Carlsbad](https://ctcfinder.com/testers/san-diego-county/carlsbad/) — 3 listings, 8 mi - [Oceanside](https://ctcfinder.com/testers/san-diego-county/oceanside/) — 9 listings, 9 mi - [Valley Center](https://ctcfinder.com/testers/san-diego-county/valley-center/) — 9 listings, 12 mi - [Poway](https://ctcfinder.com/testers/san-diego-county/poway/) — 3 listings, 14 mi - [Fallbrook](https://ctcfinder.com/testers/san-diego-county/fallbrook/) — 5 listings, 17 mi - [Ramona](https://ctcfinder.com/testers/san-diego-county/ramona/) — 6 listings, 21 mi - [Santee](https://ctcfinder.com/testers/san-diego-county/santee/) — 6 listings, 23 mi - [Lakeside](https://ctcfinder.com/testers/san-diego-county/lakeside/) — 12 listings, 23 mi