--- title: "Clean Truck Check Testers in Denair, CA (4 listed)" description: "Find 4 CARB-credentialed Clean Truck Check testers in Denair, Stanislaus County: 4 offer mobile testing, 1 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/stanislaus-county/denair/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Denair, CA 4 testing businesses in Denair (Stanislaus County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 4 offer mobile testing, 1 do smoke opacity tests, 1 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 Denair - **[Adrian Martinez](https://ctcfinder.com/tester/adrian-martinez-denair/)** — Denair, CA 95316 — (209) 535-8834. Services: mobile testing, OBD testing. - **[Andy Rutherford](https://ctcfinder.com/tester/andy-rutherford-denair/)** — Denair, CA 95316 — (209) 605-0970. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[Darrell Purdy](https://ctcfinder.com/tester/darrell-purdy-denair/)** — Denair, CA 95316 — (209) 968-5630. Services: mobile testing, OBD testing. - **[JDS Transportation Services LLC](https://ctcfinder.com/tester/jds-transportation-services-llc-denair/)** — 4716 Brandi Way, Denair, CA 95316 — (209) 859-1951. Services: mobile testing, OBD testing, motorhome testing. ## More testers within 20 miles - **[Dan's CTC](https://ctcfinder.com/tester/dans-ctc-winton/)** — 6760 California St, Winton, CA 95388 — (209) 564-1633 — 9 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Taylor's](https://ctcfinder.com/tester/taylors-winton/)** — 6171 N Winton Way, Winton, CA 95388 — (209) 261-1048 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Hargreaves Ranches LLC](https://ctcfinder.com/tester/hargreaves-ranches-llc-delhi/)** — 17736 Swanson Rd, Delhi, CA 95315 — (209) 988-7214 — 10 mi. Services: mobile testing, OBD testing. - **[Mobile Truck Check Services](https://ctcfinder.com/tester/mobile-truck-check-services-turlock/)** — 2760 Dels Ln, Turlock, CA 95382 — (209) 485-8320 — 10 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Mobile Vehicle Inspections](https://ctcfinder.com/tester/mobile-vehicle-inspections-turlock/)** — 3116 Silver Oak Ct, Turlock, CA 95382 — (209) 678-7500 — 10 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[No limit hauling & demolition](https://ctcfinder.com/tester/no-limit-hauling-and-demolition-turlock/)** — 2801 Andre Ln, Turlock, CA 95382 — (209) 818-8979 — 10 mi. Services: mobile testing, OBD testing. - **[AC AG Services, INC.](https://ctcfinder.com/tester/ac-ag-services-inc-turlock/)** — 605 W Clausen Rd, Turlock, CA 95380 — (209) 678-6867 — 12 mi. Services: mobile testing, OBD testing. - **[Balswick Quick Smog](https://ctcfinder.com/tester/balswick-quick-smog-turlock/)** — 379 N Golden State Blvd, Turlock, CA 95380 — (209) 216-7132 — 12 mi. Services: OBD testing. - **[J Jesus Mendoza Avila](https://ctcfinder.com/tester/j-jesus-mendoza-avila-turlock/)** — Turlock, CA 95380 — (209) 850-5550 — 12 mi. Services: mobile testing, OBD testing. - **[Nolan krasko's diesel smog monsters](https://ctcfinder.com/tester/nolan-kraskos-diesel-smog-monsters-turlock/)** — 120 H St, Turlock, CA 95380 — (305) 260-8458 — 12 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Elmer Araujo](https://ctcfinder.com/tester/elmer-araujo-merced/)** — Merced, CA 95348 — (209) 230-3926 — 12 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[Lomeli’s Diagnostics](https://ctcfinder.com/tester/lomelis-diagnostics-merced/)** — 3568 Tammy Ct, Merced, CA 95348 — (209) 354-6680 — 12 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. ## Trucking in Denair Stanislaus County (Modesto, Turlock, Ceres) has many food-processing and agricultural fleets on SR-99. ## 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 Denair? CTC Finder lists 4 testing businesses in Denair 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 Denair? Yes. 4 listed businesses in Denair 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 Denair? 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 - [Turlock](https://ctcfinder.com/testers/stanislaus-county/turlock/) — 7 listings, 11 mi - [Livingston](https://ctcfinder.com/testers/merced-county/livingston/) — 3 listings, 14 mi - [Ceres](https://ctcfinder.com/testers/stanislaus-county/ceres/) — 7 listings, 16 mi - [Atwater](https://ctcfinder.com/testers/merced-county/atwater/) — 5 listings, 16 mi - [Oakdale](https://ctcfinder.com/testers/stanislaus-county/oakdale/) — 5 listings, 19 mi - [Merced](https://ctcfinder.com/testers/merced-county/merced/) — 13 listings, 19 mi - [Modesto](https://ctcfinder.com/testers/stanislaus-county/modesto/) — 23 listings, 20 mi - [Escalon](https://ctcfinder.com/testers/san-joaquin-county/escalon/) — 10 listings, 27 mi - [Ripon](https://ctcfinder.com/testers/san-joaquin-county/ripon/) — 3 listings, 29 mi - [Dos Palos](https://ctcfinder.com/testers/merced-county/dos-palos/) — 4 listings, 34 mi