--- title: "Clean Truck Check Testers in Dos Palos, CA (4 listed)" description: "Find 4 CARB-credentialed Clean Truck Check testers in Dos Palos, Merced County: 2 offer mobile testing, 1 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/merced-county/dos-palos/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Dos Palos, CA 4 testing businesses in Dos Palos (Merced County) are on CARB's public Clean Truck Check tester list (4 credentialed testers). 2 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 Dos Palos - **[Gerardo Garcia Moreno](https://ctcfinder.com/tester/gerardo-garcia-moreno-dos-palos/)** — Dos Palos, CA 93620 — (209) 201-5036. Services: mobile testing, OBD testing, motorhome testing. - **[NS Tractor Dos Palos](https://ctcfinder.com/tester/ns-tractor-dos-palos-dos-palos/)** — Dos Palos, CA 93620 — (209) 631-3646. Services: mobile testing, OBD testing, motorhome testing. - **[Ricks Automotive Service](https://ctcfinder.com/tester/ricks-automotive-service-dos-palos/)** — 16237 Folsom Ave, Dos Palos, CA 93620 — (209) 829-2729. Services: OBD testing, smoke opacity (non-OBD) testing. - **[TS Truck and Trailer Repair Inc.](https://ctcfinder.com/tester/ts-truck-and-trailer-repair-inc-dos-palos/)** — 7860 Azusa Ave, Dos Palos, CA 93620 — (209) 509-9861. Services: OBD testing. ## More testers within 20 miles - **[Angel Solache](https://ctcfinder.com/tester/angel-solache-los-banos/)** — Los Banos, CA 93635 — (831) 537-4291 — 14 mi. Services: not listed. - **[Docs Towing Service](https://ctcfinder.com/tester/docs-towing-service-los-banos/)** — 2710 E Pacheco Blvd, Los Banos, CA 93635 — (209) 619-9717 — 14 mi. Services: mobile testing, OBD testing. - **[Isaiah Chavez](https://ctcfinder.com/tester/isaiah-chavez-los-banos/)** — Los Banos, CA 93635 — (209) 270-2690 — 14 mi. Services: mobile testing. - **[Jesus Nava](https://ctcfinder.com/tester/jesus-nava-los-banos/)** — Los Banos, CA 93635 — (209) 649-2304 — 14 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[The Valley Smog](https://ctcfinder.com/tester/the-valley-smog-los-banos/)** — 225 W H St, Los Banos, CA 93635 — (209) 675-4808 — 14 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Titan Towing and Roadside Assistance, Inc.](https://ctcfinder.com/tester/titan-towing-and-roadside-assistance-inc-los-banos/)** — 1559 Place Rd, Los Banos, CA 93635 — (209) 827-3200 — 14 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Westside Truck Repair INC](https://ctcfinder.com/tester/westside-truck-repair-inc-los-banos/)** — 24080 Ingomar Grade, Los Banos, CA 93635 — (209) 826-3100 — 14 mi. Services: OBD testing. - **[Windecker Fuel](https://ctcfinder.com/tester/windecker-fuel-los-banos/)** — Los Banos, CA 93635 — (209) 752-4571 — 14 mi. Services: mobile testing, OBD testing. - **[Alden Hansard](https://ctcfinder.com/tester/alden-hansard-merced/)** — Merced, CA 95341 — (209) 777-3842 — 15 mi. Services: mobile testing, OBD testing. - **[Best Electric](https://ctcfinder.com/tester/best-electric-merced/)** — 2160 Wardrobe Ave, Merced, CA 95341 — (209) 600-5568 — 15 mi. Services: mobile testing, OBD testing. - **[David Biorato](https://ctcfinder.com/tester/david-biorato-merced/)** — Merced, CA 95341 — (350) 204-9765 — 15 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Luis Nunez Rivas](https://ctcfinder.com/tester/luis-nunez-rivas-merced/)** — Merced, CA 95341 — (510) 965-3973 — 15 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 Dos Palos? CTC Finder lists 4 testing businesses in Dos Palos 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 Dos Palos? Yes. 2 listed businesses in Dos Palos 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 Dos Palos? 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 - [Los Banos](https://ctcfinder.com/testers/merced-county/los-banos/) — 8 listings, 14 mi - [Atwater](https://ctcfinder.com/testers/merced-county/atwater/) — 5 listings, 18 mi - [Merced](https://ctcfinder.com/testers/merced-county/merced/) — 13 listings, 20 mi - [Livingston](https://ctcfinder.com/testers/merced-county/livingston/) — 3 listings, 22 mi - [Mendota](https://ctcfinder.com/testers/fresno-county/mendota/) — 3 listings, 28 mi - [Madera](https://ctcfinder.com/testers/madera-county/madera/) — 15 listings, 32 mi - [Turlock](https://ctcfinder.com/testers/stanislaus-county/turlock/) — 7 listings, 34 mi - [Denair](https://ctcfinder.com/testers/stanislaus-county/denair/) — 4 listings, 34 mi - [Kerman](https://ctcfinder.com/testers/fresno-county/kerman/) — 3 listings, 35 mi - [Hollister](https://ctcfinder.com/testers/san-benito-county/hollister/) — 7 listings, 40 mi