--- title: "Clean Truck Check Testers in Winters, CA (4 listed)" description: "Find 4 CARB-credentialed Clean Truck Check testers in Winters, Yolo County: 4 offer mobile testing, 1 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/yolo-county/winters/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Winters, CA 4 testing businesses in Winters (Yolo County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 4 offer mobile testing, 1 do smoke opacity tests, 2 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 Winters - **[A+ Clean Truck Check](https://ctcfinder.com/tester/a-clean-truck-check-winters/)** — 1029 Village Cir, Winters, CA 95694 — (530) 378-9111. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Felipe Alarcon](https://ctcfinder.com/tester/felipe-alarcon-winters/)** — Winters, CA 95694 — (530) 908-4658. Services: mobile testing, OBD testing. - **[J.T. Martin Trucking](https://ctcfinder.com/tester/j-t-martin-trucking-winters/)** — 4860 Jaybee Ln, Winters, CA 95694 — (530) 400-1202. Services: mobile testing, OBD testing. - **[SF Transport Inc.](https://ctcfinder.com/tester/sf-transport-inc-winters/)** — 736 Foxglove Cir, Winters, CA 95694 — (530) 750-9320. Services: mobile testing, OBD testing, motorhome testing. ## More testers within 20 miles - **[All Sacramento/Bay Area](https://ctcfinder.com/tester/all-sacramento-bay-area-vacaville/)** — Vacaville, CA 95688 — (916) 243-5089 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Brian Tierney](https://ctcfinder.com/tester/brian-tierney-vacaville/)** — Vacaville, CA 95688 — (707) 363-4083 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Buckners Truck Check](https://ctcfinder.com/tester/buckners-truck-check-vacaville/)** — 137 Suncrest Way, Vacaville, CA 95688 — (707) 828-4016 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[C.A.R.B Credentialed Tester- MOBILE TESTING](https://ctcfinder.com/tester/c-a-r-b-credentialed-tester-mobile-testing-vacaville/)** — Vacaville, CA 95688 — (916) 538-7777 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[I505 truck and trailer repair](https://ctcfinder.com/tester/i505-truck-and-trailer-repair-vacaville/)** — 251 Crocker Dr, Vacaville, CA 95688 — (707) 815-2003 — 11 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Gerardo Vargas](https://ctcfinder.com/tester/gerardo-vargas-esparto/)** — Esparto, CA 95627 — (530) 402-5263 — 11 mi. Services: mobile testing, OBD testing. - **[Paul Mendoza](https://ctcfinder.com/tester/paul-mendoza-woodland/)** — Woodland, CA 95695 — (530) 514-5441 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Vadim Yev CAPITAL CITY DIESEL INSPECTIONS](https://ctcfinder.com/tester/vadim-yev-capital-city-diesel-inspections-woodland/)** — 10 West Main St, Woodland, CA 95695 — (916) 538-7777 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Yolo Smog](https://ctcfinder.com/tester/yolo-smog-woodland/)** — 374 W Main St, Woodland, CA 95695 — (530) 383-9330 — 14 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Hector Kreitz](https://ctcfinder.com/tester/hector-kreitz-napa/)** — Napa, CA 94558 — (707) 704-9863 — 14 mi. Services: mobile testing, OBD testing. - **[JB Mobile Service](https://ctcfinder.com/tester/jb-mobile-service-napa/)** — 787 Airpark Rd, Napa, CA 94558 — (707) 206-5358 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[Napa Valley RV and Truck](https://ctcfinder.com/tester/napa-valley-rv-and-truck-napa/)** — 26 Big Leaf Ct, Napa, CA 94558 — (707) 850-6624 — 14 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 Winters? CTC Finder lists 4 testing businesses in Winters 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 Winters? Yes. 4 listed businesses in Winters 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 Winters? 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 - [Vacaville](https://ctcfinder.com/testers/solano-county/vacaville/) — 6 listings, 12 mi - [Woodland](https://ctcfinder.com/testers/yolo-county/woodland/) — 12 listings, 20 mi - [Dixon](https://ctcfinder.com/testers/solano-county/dixon/) — 8 listings, 20 mi - [Napa](https://ctcfinder.com/testers/napa-county/napa/) — 11 listings, 21 mi - [Fairfield](https://ctcfinder.com/testers/solano-county/fairfield/) — 11 listings, 22 mi - [West Sacramento](https://ctcfinder.com/testers/yolo-county/west-sacramento/) — 21 listings, 26 mi - [Arbuckle](https://ctcfinder.com/testers/colusa-county/arbuckle/) — 4 listings, 30 mi - [Sonoma](https://ctcfinder.com/testers/sonoma-county/sonoma/) — 5 listings, 31 mi - [Vallejo](https://ctcfinder.com/testers/solano-county/vallejo/) — 8 listings, 33 mi - [Sacramento](https://ctcfinder.com/testers/sacramento-county/sacramento/) — 68 listings, 34 mi