--- title: "Clean Truck Check Testers in Redwood City, CA (3 listed)" description: "Find 3 CARB-credentialed Clean Truck Check testers in Redwood City, San Mateo County: 3 offer mobile testing, 3 do smoke opacity tests. Phone numbers, services…" url: "https://ctcfinder.com/testers/san-mateo-county/redwood-city/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Redwood City, CA 3 testing businesses in Redwood City (San Mateo County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 3 offer mobile testing, 3 do smoke opacity tests, 3 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 Redwood City - **[Filthy Busters Inc.](https://ctcfinder.com/tester/filthy-busters-inc-redwood-city/)** — 1249 Sabrina Ct, Redwood City, CA 94061 — (510) 326-5901. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Balboni Electric](https://ctcfinder.com/tester/balboni-electric-redwood-city/)** — 823 Cleveland St, Redwood City, CA 94061 — (650) 766-4997. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Peninsula Truck Repair, INC.](https://ctcfinder.com/tester/peninsula-truck-repair-inc-redwood-city/)** — 3018 Spring St, Redwood City, CA 94063 — (831) 419-7042. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## More testers within 20 miles - **[TJF Solutions](https://ctcfinder.com/tester/tjf-solutions-menlo-park/)** — 3523 Haven Ave, Menlo Park, CA 94025 — (650) 771-4532 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Carbcheck1](https://ctcfinder.com/tester/carbcheck1-san-carlos/)** — San Carlos, CA 94070 — (650) 430-3981 — 3 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Holly Smog](https://ctcfinder.com/tester/holly-smog-san-carlos/)** — 501 Old County Rd Suite A, San Carlos, CA 94070 — (650) 595-1388 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Sunshine Transportation](https://ctcfinder.com/tester/sunshine-transportation-east-palo-alto/)** — East Palo Alto, CA 94303 — (650) 921-0717 — 6 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Hengehold Trucks](https://ctcfinder.com/tester/hengehold-trucks-palo-alto/)** — 762 San Antonio Rd, Palo Alto, CA 94303 — (650) 494-2444 — 6 mi. Services: OBD testing, motorhome testing. - **[Less Smog Check](https://ctcfinder.com/tester/less-smog-check-san-mateo/)** — 3925 S El Camino Real, San Mateo, CA 94403 — (669) 377-4881 — 6 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mobile Golden State Emissions San Mateo](https://ctcfinder.com/tester/mobile-golden-state-emissions-san-mateo-san-mateo/)** — 3500 Edison St., San Mateo, CA 94403 — (925) 818-1831 — 6 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Ron Ramies Inc](https://ctcfinder.com/tester/ron-ramies-inc-portola-valley/)** — 115 Portola Rd, Portola Valley, CA 94028 — (650) 400-2116 — 7 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Charlotte Cuschieri](https://ctcfinder.com/tester/charlotte-cuschieri-san-mateo/)** — San Mateo, CA 94402 — (650) 455-8824 — 8 mi. Services: OBD testing, motorhome testing. - **[EV Auto Service LLC](https://ctcfinder.com/tester/ev-auto-service-llc-san-mateo/)** — 110 S Claremont St, San Mateo, CA 94401 — (650) 293-7738 — 9 mi. Services: mobile testing, OBD testing, motorhome testing. - **[American Construction & Excavation](https://ctcfinder.com/tester/american-construction-and-excavation-mountain-view/)** — 1124 Independence Ave, Mountain View, CA 94043 — (650) 935-5104 — 9 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Mountain View Smog Center](https://ctcfinder.com/tester/mountain-view-smog-center-mountain-view/)** — Mountain View, CA 94040 — (650) 938-7664 — 10 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 Redwood City? CTC Finder lists 3 testing businesses in Redwood City 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 Redwood City? Yes. 3 listed businesses in Redwood City 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 Redwood City? 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 - [San Mateo](https://ctcfinder.com/testers/san-mateo-county/san-mateo/) — 4 listings, 7 mi - [Mountain View](https://ctcfinder.com/testers/santa-clara-county/mountain-view/) — 3 listings, 10 mi - [Newark](https://ctcfinder.com/testers/alameda-county/newark/) — 4 listings, 11 mi - [Union City](https://ctcfinder.com/testers/alameda-county/union-city/) — 6 listings, 12 mi - [Hayward](https://ctcfinder.com/testers/alameda-county/hayward/) — 18 listings, 13 mi - [Fremont](https://ctcfinder.com/testers/alameda-county/fremont/) — 12 listings, 15 mi - [San Lorenzo](https://ctcfinder.com/testers/alameda-county/san-lorenzo/) — 3 listings, 15 mi - [Santa Clara](https://ctcfinder.com/testers/santa-clara-county/santa-clara/) — 3 listings, 15 mi - [San Bruno](https://ctcfinder.com/testers/san-mateo-county/san-bruno/) — 4 listings, 16 mi - [South San Francisco](https://ctcfinder.com/testers/san-mateo-county/south-san-francisco/) — 5 listings, 17 mi