--- title: "Clean Truck Check Testers in Downey, CA (9 listed)" description: "Find 9 CARB-credentialed Clean Truck Check testers in Downey, Los Angeles County: 7 offer mobile testing, 3 do smoke opacity tests. Phone numbers, services and…" url: "https://ctcfinder.com/testers/los-angeles-county/downey/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Downey, CA 9 testing businesses in Downey (Los Angeles County) are on CARB's public Clean Truck Check tester list (10 credentialed testers). 7 offer mobile testing, 3 do smoke opacity tests, 4 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 Downey - **[Downey Smog CORP](https://ctcfinder.com/tester/downey-smog-corp-downey/)** — 10801 Studebaker Rd, Downey, CA 90241 — (562) 863-4085. Services: OBD testing, motorhome testing. - **[Eagle Smog](https://ctcfinder.com/tester/eagle-smog-downey/)** — 9476 Telegraph Rd, Downey, CA 90240 — (562) 360-0649. Services: OBD testing, motorhome testing. - **[Elevate Testing Services](https://ctcfinder.com/tester/elevate-testing-services-downey/)** — 7440 LAURA ST, Downey, CA 90242 — (562) 922-5449. Services: mobile testing, OBD testing. - **[Itch Vargas](https://ctcfinder.com/tester/itch-vargas-downey/)** — Downey, CA 90241 — (562) 755-4085. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing. - **[OG services](https://ctcfinder.com/tester/og-services-downey/)** — 9127 Brookshire Avenue, Downey, CA 90240 — (323) 369-0501. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Onsite Fleet Mobile Compliance](https://ctcfinder.com/tester/onsite-fleet-mobile-compliance-downey/)** — 9554 Telegraph Rd, Downey, CA 90240 — (562) 261-6867. Services: mobile testing, OBD testing. - **[Osvaldo Delmuro](https://ctcfinder.com/tester/osvaldo-delmuro-downey/)** — Downey, CA 90240 — (562) 250-9351. Services: mobile testing, OBD testing. - **[Rivera truck repair](https://ctcfinder.com/tester/rivera-truck-repair-downey/)** — Downey, CA 90241 — (323) 601-7739. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Simple Services For You](https://ctcfinder.com/tester/simple-services-for-you-downey/)** — 8050 Florence ave Suite 22, Downey, CA 90240 — (323) 608-3659. Services: mobile testing, OBD testing. ## More testers within 20 miles - **[Cox Automotive Dickinson Fleet](https://ctcfinder.com/tester/cox-automotive-dickinson-fleet-bell/)** — Bell, CA 90201 — (463) 231-7162 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Ace Diesel](https://ctcfinder.com/tester/ace-diesel-bell-gardens/)** — 8450 Garfield Ave, Bell Gardens, CA 90201 — (562) 307-2944 — 3 mi. Services: OBD testing. - **[Ace Diesel Service](https://ctcfinder.com/tester/ace-diesel-service-bell-gardens/)** — 8450 Garfield Ave, Bell Gardens, CA 90201 — (562) 307-2941 — 3 mi. Services: OBD testing, smoke opacity (non-OBD) testing. - **[Alex's Auto Smog](https://ctcfinder.com/tester/alexs-auto-smog-bell-gardens/)** — 6301 Florence Ave, Bell Gardens, CA 90201 — (323) 250-2539 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[H and R Mobile truck repair](https://ctcfinder.com/tester/h-and-r-mobile-truck-repair-bell-gardens/)** — 6319 Gifford Ave, Bell Gardens, CA 90201 — (562) 523-5752 — 3 mi. Services: mobile testing, OBD testing. - **[Josue Lucero](https://ctcfinder.com/tester/josue-lucero-bell-gardens/)** — Bell Gardens, CA 90201 — (323) 453-2944 — 3 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Clean Solutions CTC Testing](https://ctcfinder.com/tester/clean-solutions-ctc-testing-pico-rivera/)** — 9666 Goodbee Street, Pico Rivera, CA 90660 — (323) 542-3320 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Fedex](https://ctcfinder.com/tester/fedex-pico-rivera/)** — 9107 Hightree St, Pico Rivera, CA 90660 — (323) 998-3450 — 4 mi. Services: not listed. - **[Fig's Mobile Service](https://ctcfinder.com/tester/figs-mobile-service-pico-rivera/)** — 8239 Pico Rivera, Pico Rivera, CA 90660 — (323) 898-2626 — 4 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Next Freight, Inc.](https://ctcfinder.com/tester/next-freight-inc-pico-rivera/)** — 7700 Industry Avenue, Pico Rivera, CA 90660 — (562) 824-1975 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Rush Truck Center- Los Angeles](https://ctcfinder.com/tester/rush-truck-center-los-angeles-pico-rivera/)** — 8830 Slauson Avenue, Pico Rivera, CA 90660 — (424) 536-7574 — 4 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Steven Turner](https://ctcfinder.com/tester/steven-turner-pico-rivera/)** — Pico Rivera, CA 90660 — (562) 639-1438 — 4 mi. Services: mobile testing, smoke opacity (non-OBD) testing. ## Trucking in Downey Los Angeles County has more listed testers than any other county. Seaports and intermodal railyards, including the Ports of Los Angeles and Long Beach, must verify Clean Truck Check compliance at entry or log non-compliant trucks (CARB). ## 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 Downey? CTC Finder lists 9 testing businesses in Downey from CARB's public tester list (10 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 Downey? Yes. 7 listed businesses in Downey 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 Downey? 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 - [Bell Gardens](https://ctcfinder.com/testers/los-angeles-county/bell-gardens/) — 5 listings, 3 mi - [Pico Rivera](https://ctcfinder.com/testers/los-angeles-county/pico-rivera/) — 6 listings, 4 mi - [Norwalk](https://ctcfinder.com/testers/los-angeles-county/norwalk/) — 5 listings, 4 mi - [Santa Fe Springs](https://ctcfinder.com/testers/los-angeles-county/santa-fe-springs/) — 11 listings, 4 mi - [South Gate](https://ctcfinder.com/testers/los-angeles-county/south-gate/) — 13 listings, 4 mi - [Commerce](https://ctcfinder.com/testers/los-angeles-county/commerce/) — 7 listings, 4 mi - [Bellflower](https://ctcfinder.com/testers/los-angeles-county/bellflower/) — 8 listings, 4 mi - [Paramount](https://ctcfinder.com/testers/los-angeles-county/paramount/) — 3 listings, 4 mi - [Lynwood](https://ctcfinder.com/testers/los-angeles-county/lynwood/) — 6 listings, 5 mi - [Montebello](https://ctcfinder.com/testers/los-angeles-county/montebello/) — 8 listings, 5 mi