--- title: "Clean Truck Check Testers in Oakley, CA (9 listed)" description: "Find 9 CARB-credentialed Clean Truck Check testers in Oakley, Contra Costa County: 9 offer mobile testing, 6 do smoke opacity tests. Phone numbers, services…" url: "https://ctcfinder.com/testers/contra-costa-county/oakley/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Oakley, CA 9 testing businesses in Oakley (Contra Costa County) are on CARB's public Clean Truck Check tester list (9 credentialed testers). 9 offer mobile testing, 6 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 Oakley - **[Black Diamond Clean Truck Check](https://ctcfinder.com/tester/black-diamond-clean-truck-check-oakley/)** — 3801 Daniel Dr, Oakley, CA 94561 — (925) 305-7586. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Creekside Notary & Consulting](https://ctcfinder.com/tester/creekside-notary-and-consulting-oakley/)** — 100 Heavenly Way, Oakley, CA 94561 — (925) 584-4493. Services: mobile testing, OBD testing. - **[E&J Truck and Equipment Repair](https://ctcfinder.com/tester/e-and-j-truck-and-equipment-repair-oakley/)** — Oakley, CA 94561 — (510) 393-2869. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[E&J Truck and Equipment Repair LLC](https://ctcfinder.com/tester/e-and-j-truck-and-equipment-repair-llc-oakley/)** — 115 Muir Ct, Oakley, CA 94561 — (707) 515-8539. Services: mobile testing, OBD testing. - **[Edward Chavez Pinzon](https://ctcfinder.com/tester/edward-chavez-pinzon-oakley/)** — Oakley, CA 94561 — (925) 759-8133. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[JS Repair](https://ctcfinder.com/tester/js-repair-oakley/)** — 659 Lois Ln, Oakley, CA 94561 — (650) 745-6625. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mobile Golden State Emissions Oakley](https://ctcfinder.com/tester/mobile-golden-state-emissions-oakley-oakley/)** — 5301 Elm Ln, Oakley, CA 94561 — (925) 354-4370. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[SAM 99](https://ctcfinder.com/tester/sam-99-oakley/)** — 917 Chianti Way, Oakley, CA 94561 — (510) 602-5456. Services: mobile testing, OBD testing. - **[Scott Belt](https://ctcfinder.com/tester/scott-belt-oakley/)** — Oakley, CA 94561 — (925) 525-3859. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. ## More testers within 20 miles - **[ClearSky Heavy Truck Smog](https://ctcfinder.com/tester/clearsky-heavy-truck-smog-brentwood/)** — 8175 Brentwood Blvd, Brentwood, CA 94513 — (916) 385-2299 — 5 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Cruz in Smog Check](https://ctcfinder.com/tester/cruz-in-smog-check-brentwood/)** — 191 Pippo Ave, Brentwood, CA 94513 — (925) 382-8606 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[DavidL](https://ctcfinder.com/tester/davidl-brentwood/)** — 435 Walnut Blvd, Brentwood, CA 94513 — (925) 605-8197 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Junior Mobile Automotive Repair LCC](https://ctcfinder.com/tester/junior-mobile-automotive-repair-lcc-antioch/)** — 4464 Lone Tree Way, Antioch, CA 94531 — (925) 246-5829 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mr.CTC Inspector](https://ctcfinder.com/tester/mr-ctc-inspector-antioch/)** — 5101 Homestead Ct, Antioch, CA 94531 — (925) 317-4000 — 5 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[A1 Stop Smog](https://ctcfinder.com/tester/a1-stop-smog-antioch/)** — 1810 Verne Roberts Cir, Antioch, CA 94509 — (925) 445-7875 — 7 mi. Services: OBD testing, motorhome testing. - **[Charlotte Larsen](https://ctcfinder.com/tester/charlotte-larsen-antioch/)** — Antioch, CA 94509 — (925) 374-2879 — 7 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Contra Costa Mobile Repair](https://ctcfinder.com/tester/contra-costa-mobile-repair-antioch/)** — 1915 Cavallo Rd, Antioch, CA 94509 — (925) 437-1397 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Drill Tech Drilling Shoring Inc.](https://ctcfinder.com/tester/drill-tech-drilling-shoring-inc-antioch/)** — 2200 Wymore Way, Antioch, CA 94509 — (510) 715-3737 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Habibullah Nazari](https://ctcfinder.com/tester/habibullah-nazari-antioch/)** — Antioch, CA 94509 — (925) 445-7319 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Miguel Rodriguez](https://ctcfinder.com/tester/miguel-rodriguez-antioch/)** — Antioch, CA 94509 — (925) 752-8831 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mobile Golden State Emissions Testing Antioch](https://ctcfinder.com/tester/mobile-golden-state-emissions-testing-antioch-antioch/)** — 19 West 16th Street, Antioch, CA 94509 — (925) 354-4370 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-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 Oakley? CTC Finder lists 9 testing businesses in Oakley 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 Oakley? Yes. 9 listed businesses in Oakley 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 Oakley? 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 - [Brentwood](https://ctcfinder.com/testers/contra-costa-county/brentwood/) — 3 listings, 5 mi - [Antioch](https://ctcfinder.com/testers/contra-costa-county/antioch/) — 11 listings, 6 mi - [Pittsburg](https://ctcfinder.com/testers/contra-costa-county/pittsburg/) — 5 listings, 13 mi - [Concord](https://ctcfinder.com/testers/contra-costa-county/concord/) — 7 listings, 18 mi - [Livermore](https://ctcfinder.com/testers/alameda-county/livermore/) — 8 listings, 21 mi - [Stockton](https://ctcfinder.com/testers/san-joaquin-county/stockton/) — 50 listings, 21 mi - [Dublin](https://ctcfinder.com/testers/alameda-county/dublin/) — 4 listings, 22 mi - [Tracy](https://ctcfinder.com/testers/san-joaquin-county/tracy/) — 21 listings, 23 mi - [French Camp](https://ctcfinder.com/testers/san-joaquin-county/french-camp/) — 3 listings, 23 mi - [Lathrop](https://ctcfinder.com/testers/san-joaquin-county/lathrop/) — 5 listings, 24 mi