--- title: "Clean Truck Check Testers in Atascadero, CA (6 listed)" description: "Find 6 CARB-credentialed Clean Truck Check testers in Atascadero, San Luis Obispo County: 6 offer mobile testing, 4 do smoke opacity tests. Phone numbers…" url: "https://ctcfinder.com/testers/san-luis-obispo-county/atascadero/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Atascadero, CA 6 testing businesses in Atascadero (San Luis Obispo County) are on CARB's public Clean Truck Check tester list (6 credentialed testers). 6 offer mobile testing, 4 do smoke opacity tests, 6 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 Atascadero - **[Affordable Auto Care](https://ctcfinder.com/tester/affordable-auto-care-atascadero/)** — 4495 Traffic Way, Atascadero, CA 93422 — (805) 258-1495. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Bennett Diesel Repair](https://ctcfinder.com/tester/bennett-diesel-repair-atascadero/)** — 3355 Chico Rd, Atascadero, CA 93422 — (805) 423-6132. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Darrell Dillard](https://ctcfinder.com/tester/darrell-dillard-atascadero/)** — Atascadero, CA 93422 — (805) 674-8110. Services: mobile testing, OBD testing, motorhome testing. - **[GK's Clean Truck](https://ctcfinder.com/tester/gks-clean-truck-atascadero/)** — 1500 N Ferrocarril Rd, Atascadero, CA 93422 — (805) 538-4991. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Jeff's Auto Works](https://ctcfinder.com/tester/jeffs-auto-works-atascadero/)** — 9000 El Camino Real, Atascadero, CA 93422 — (805) 459-7830. Services: mobile testing, OBD testing, motorhome testing. - **[Specialized Equipment Repair](https://ctcfinder.com/tester/specialized-equipment-repair-atascadero/)** — 9005 El Camino Real, Atascadero, CA 93422 — (805) 466-1066. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## More testers within 20 miles - **[Mtech Unlimited](https://ctcfinder.com/tester/mtech-unlimited-templeton/)** — Templeton, CA 93465 — (805) 550-8744 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[MAFFEIS Automotive](https://ctcfinder.com/tester/maffeis-automotive-morro-bay/)** — 1700 Park St, Morro Bay, CA 93442 — (805) 369-9222 — 8 mi. Services: OBD testing, motorhome testing. - **[Coops Carb Compliance LLC](https://ctcfinder.com/tester/coops-carb-compliance-llc-paso-robles/)** — 6520 Long Hill Pl, Paso Robles, CA 93446 — (620) 778-2208 — 13 mi. Services: mobile testing, OBD testing. - **[D's Diesel N' Off- Road](https://ctcfinder.com/tester/ds-diesel-n-off-road-paso-robles/)** — 6085 Eucalyptus Rd, Paso Robles, CA 93446 — (805) 286-8116 — 13 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Dye's Mobile Diesel Smoke Testing](https://ctcfinder.com/tester/dyes-mobile-diesel-smoke-testing-paso-robles/)** — 655 Cripple Creek Rd, Paso Robles, CA 93446 — (805) 835-2893 — 13 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Kings Oil Tools](https://ctcfinder.com/tester/kings-oil-tools-paso-robles/)** — Paso Robles, CA 93446 — (805) 610-2796 — 13 mi. Services: mobile testing, OBD testing. - **[Mid-State Repair & Service](https://ctcfinder.com/tester/mid-state-repair-and-service-paso-robles/)** — 1946 Wood Duck Ln, Paso Robles, CA 93446 — (805) 729-1068 — 13 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Am Pac Repair](https://ctcfinder.com/tester/am-pac-repair-san-luis-obispo/)** — 4149 Santa Fe Rd Suite 8, San Luis Obispo, CA 93401 — (805) 459-4724 — 16 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Bunyon Bros Tree Service](https://ctcfinder.com/tester/bunyon-bros-tree-service-san-luis-obispo/)** — 5345 Davenport Creek Rd, San Luis Obispo, CA 93401 — (805) 503-8838 — 16 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Central Coast Fleet Compliance](https://ctcfinder.com/tester/central-coast-fleet-compliance-san-luis-obispo/)** — 3940 Broad St Ste 7-177, San Luis Obispo, CA 93401 — (805) 222-6869 — 16 mi. Services: mobile testing, OBD testing, motorhome testing. - **[SLO Smog](https://ctcfinder.com/tester/slo-smog-san-luis-obispo/)** — 233 Granada Dr Suite C, San Luis Obispo, CA 93401 — (805) 858-0741 — 16 mi. Services: mobile testing, OBD testing, motorhome 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 Atascadero? CTC Finder lists 6 testing businesses in Atascadero from CARB's public tester list (6 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 Atascadero? Yes. 6 listed businesses in Atascadero 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 Atascadero? 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 - [Paso Robles](https://ctcfinder.com/testers/san-luis-obispo-county/paso-robles/) — 5 listings, 13 mi - [San Luis Obispo](https://ctcfinder.com/testers/san-luis-obispo-county/san-luis-obispo/) — 4 listings, 16 mi - [Nipomo](https://ctcfinder.com/testers/san-luis-obispo-county/nipomo/) — 3 listings, 31 mi