--- title: "Clean Truck Check Testers in Fremont, CA (12 listed)" description: "Find 12 CARB-credentialed Clean Truck Check testers in Fremont, Alameda County: 12 offer mobile testing, 4 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/alameda-county/fremont/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Fremont, CA 12 testing businesses in Fremont (Alameda County) are on CARB's public Clean Truck Check tester list (13 credentialed testers). 12 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 Fremont - **[Yong Hu](https://ctcfinder.com/tester/yong-hu-fremont/)** — Fremont, CA 94536 — (626) 955-9566. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Auto Mall Smog Test & Repair](https://ctcfinder.com/tester/auto-mall-smog-test-and-repair-fremont/)** — 43026 Christy St, Fremont, CA 94538 — (510) 493-1865. Services: mobile testing, OBD testing. - **[Autotek CNG Services](https://ctcfinder.com/tester/autotek-cng-services-fremont/)** — 4299 Peralta Blvd Suite A, Fremont, CA 94536 — (510) 445-3055. Services: mobile testing, OBD testing, motorhome testing. - **[Continental Truck Repair](https://ctcfinder.com/tester/continental-truck-repair-fremont/)** — Fremont, CA 94538 — (510) 709-7512. Services: mobile testing, OBD testing. - **[Continental Truck Tire & Trailer Repair](https://ctcfinder.com/tester/continental-truck-tire-and-trailer-repair-fremont/)** — 42400 Boyce Rd, Fremont, CA 94538 — (510) 766-5932. Services: mobile testing, OBD testing. - **[Dora Lopez](https://ctcfinder.com/tester/dora-lopez-fremont/)** — Fremont, CA 94536 — (650) 208-9960. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[Fremont Quick Smog](https://ctcfinder.com/tester/fremont-quick-smog-fremont/)** — 43248 Grimmer Blvd, Fremont, CA 94538 — (510) 270-8555. Services: mobile testing, OBD testing, motorhome testing. - **[HMSM group inc](https://ctcfinder.com/tester/hmsm-group-inc-fremont/)** — 43560 Bryant St, Fremont, CA 94539 — (831) 578-5663. Services: mobile testing, OBD testing, motorhome testing. - **[Kevin J Hutchins](https://ctcfinder.com/tester/kevin-j-hutchins-fremont/)** — Fremont, CA 94536 — (510) 449-7888. Services: mobile testing, OBD testing. - **[Longoria Bros Clean Truck Check](https://ctcfinder.com/tester/longoria-bros-clean-truck-check-fremont/)** — 37810 Von Euw Cmn, Fremont, CA 94536 — (510) 712-0483. Services: mobile testing, OBD testing. - **[MingxuanHu](https://ctcfinder.com/tester/mingxuanhu-fremont/)** — 4837 El Poco Cmn, Fremont, CA 94536 — (909) 569-3922. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Sumanjit Punia](https://ctcfinder.com/tester/sumanjit-punia-fremont/)** — Fremont, CA 94536 — (510) 402-3858. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## More testers within 20 miles - **[Aman Smog](https://ctcfinder.com/tester/aman-smog-newark/)** — 6240 Market Ave, Newark, CA 94560 — (510) 589-8108 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Highway Tires and Truck/Trailer Repair](https://ctcfinder.com/tester/highway-tires-and-truck-trailer-repair-newark/)** — 6711 Central Ave, Newark, CA 94560 — (510) 602-5340 — 4 mi. Services: OBD testing. - **[L & D mobile repair](https://ctcfinder.com/tester/l-and-d-mobile-repair-newark/)** — 38599 Rockrose Ct, Newark, CA 94560 — (209) 321-5293 — 4 mi. Services: mobile testing, OBD testing, motorhome testing. - **[L&D Repair](https://ctcfinder.com/tester/l-and-d-repair-newark/)** — 38599 Rockrose Ct, Newark, CA 94560 — (619) 347-4279 — 4 mi. Services: mobile testing, OBD testing. - **[Bay Star Auto INC](https://ctcfinder.com/tester/bay-star-auto-inc-union-city/)** — 1275 Atlantic St, Union City, CA 94587 — (510) 489-3331 — 7 mi. Services: OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Cuong Vuong](https://ctcfinder.com/tester/cuong-vuong-union-city/)** — Union City, CA 94587 — (951) 433-0641 — 7 mi. Services: mobile testing, OBD testing. - **[Lally Truck &Tire Service INC](https://ctcfinder.com/tester/lally-truck-and-tire-service-inc-union-city/)** — 4600 Horner St, Union City, CA 94587 — (510) 557-1374 — 7 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Manjot Mashiana](https://ctcfinder.com/tester/manjot-mashiana-union-city/)** — Union City, CA 94587 — (510) 894-5468 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[SJ Diesel Smog Test](https://ctcfinder.com/tester/sj-diesel-smog-test-union-city/)** — 34625 Arroyo Dr, Union City, CA 94587 — (510) 314-9937 — 7 mi. Services: mobile testing, OBD testing. - **[Total Multi Services INC](https://ctcfinder.com/tester/total-multi-services-inc-union-city/)** — 1780 Whipple Rd Suite 110, Union City, CA 94587 — (510) 767-7165 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Jaswinder Singh](https://ctcfinder.com/tester/jaswinder-singh-hayward/)** — Hayward, CA 94544 — (510) 579-7294 — 8 mi. Services: mobile testing, OBD testing, motorhome testing. - **[JR Trucking Services](https://ctcfinder.com/tester/jr-trucking-services-hayward/)** — 479 Custer Rd, Hayward, CA 94544 — (510) 589-2917 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. ## Trucking in Fremont Alameda County includes the Port of Oakland and the I-880 industrial corridor (Hayward, San Leandro, Fremont). ## 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 Fremont? CTC Finder lists 12 testing businesses in Fremont from CARB's public tester list (13 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 Fremont? Yes. 12 listed businesses in Fremont 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 Fremont? 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 - [Newark](https://ctcfinder.com/testers/alameda-county/newark/) — 4 listings, 4 mi - [Union City](https://ctcfinder.com/testers/alameda-county/union-city/) — 6 listings, 7 mi - [Milpitas](https://ctcfinder.com/testers/santa-clara-county/milpitas/) — 3 listings, 9 mi - [Hayward](https://ctcfinder.com/testers/alameda-county/hayward/) — 18 listings, 9 mi - [Santa Clara](https://ctcfinder.com/testers/santa-clara-county/santa-clara/) — 3 listings, 10 mi - [Mountain View](https://ctcfinder.com/testers/santa-clara-county/mountain-view/) — 3 listings, 12 mi - [Dublin](https://ctcfinder.com/testers/alameda-county/dublin/) — 4 listings, 12 mi - [San Lorenzo](https://ctcfinder.com/testers/alameda-county/san-lorenzo/) — 3 listings, 13 mi - [Redwood City](https://ctcfinder.com/testers/san-mateo-county/redwood-city/) — 3 listings, 15 mi - [San Leandro](https://ctcfinder.com/testers/alameda-county/san-leandro/) — 8 listings, 15 mi