--- title: "Clean Truck Check Testers in Simi Valley, CA (8 listed)" description: "Find 8 CARB-credentialed Clean Truck Check testers in Simi Valley, Ventura County: 8 offer mobile testing, 4 do smoke opacity tests. Phone numbers, services…" url: "https://ctcfinder.com/testers/ventura-county/simi-valley/" updated: "2026-11-01" publisher: "CTC Finder (independent directory, not affiliated with CARB)" --- # Clean Truck Check testers in Simi Valley, CA 8 testing businesses in Simi Valley (Ventura County) are on CARB's public Clean Truck Check tester list (8 credentialed testers). 8 offer mobile testing, 4 do smoke opacity tests, 8 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 Simi Valley - **[A1 Emissions](https://ctcfinder.com/tester/a1-emissions-simi-valley/)** — 1933 3rd St, Simi Valley, CA 93065 — (805) 857-1085. Services: mobile testing, OBD testing, motorhome testing. - **[Big Rig Smog](https://ctcfinder.com/tester/big-rig-smog-simi-valley/)** — 4212 E Los Angeles Ave, Simi Valley, CA 93063 — (805) 638-3911. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[IM Clean Truck Check](https://ctcfinder.com/tester/im-clean-truck-check-simi-valley/)** — 4892 Borders St, Simi Valley, CA 93063 — (805) 823-9749. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Juans Truck Smog](https://ctcfinder.com/tester/juans-truck-smog-simi-valley/)** — 679 E Easy St, Simi Valley, CA 93065 — (442) 322-0055. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[KC Truck Smog](https://ctcfinder.com/tester/kc-truck-smog-simi-valley/)** — 939 Talbert Ave, Simi Valley, CA 93065 — (805) 404-8842. Services: mobile testing, OBD testing, motorhome testing. - **[Simi Smog Doc](https://ctcfinder.com/tester/simi-smog-doc-simi-valley/)** — 1382 E Los Angeles Ave Suite C, Simi Valley, CA 93065 — (805) 509-3143. Services: mobile testing, OBD testing, motorhome testing. - **[Standby Truck Testing](https://ctcfinder.com/tester/standby-truck-testing-simi-valley/)** — 841 Greenbriar Ave, Simi Valley, CA 93065 — (805) 625-4872. Services: mobile testing, OBD testing, motorhome testing. - **[Truck/motorhome CTC](https://ctcfinder.com/tester/truck-motorhome-ctc-simi-valley/)** — 679 E Easy St, Simi Valley, CA 93065 — (805) 638-3911. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. ## More testers within 20 miles - **[Michael Gil](https://ctcfinder.com/tester/michael-gil-thousand-oaks/)** — Thousand Oaks, CA 91362 — (424) 373-2726 — 7 mi. Services: mobile testing, OBD testing. - **[Roys Towing](https://ctcfinder.com/tester/roys-towing-thousand-oaks/)** — 1344 E Thousand Oaks Blvd, Thousand Oaks, CA 91362 — (805) 443-6639 — 7 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Smogz4less-ctc](https://ctcfinder.com/tester/smogz4less-ctc-thousand-oaks/)** — 3111 E Thousand Oaks Blvd#5A, Thousand Oaks, CA 91362 — (805) 670-3883 — 7 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Bulstar Trucking Inc](https://ctcfinder.com/tester/bulstar-trucking-inc-west-hills/)** — 7545 Royer Ave, West Hills, CA 91307 — (310) 994-8332 — 7 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Hi-Tech Auto](https://ctcfinder.com/tester/hi-tech-auto-moorpark/)** — 13806 Princeton Ave, Moorpark, CA 93021 — (805) 813-1145 — 8 mi. Services: mobile testing, OBD testing, motorhome testing. - **[Kaylee Wale](https://ctcfinder.com/tester/kaylee-wale-moorpark/)** — Moorpark, CA 93021 — (805) 416-6230 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Moorpark Diesel LLC](https://ctcfinder.com/tester/moorpark-diesel-llc-moorpark/)** — 619 Fitch Ave, Moorpark, CA 93021 — (805) 891-3313 — 8 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Rodriguez Trucking Mobile Diesel Repair](https://ctcfinder.com/tester/rodriguez-trucking-mobile-diesel-repair-moorpark/)** — 6416 N Duke St, Moorpark, CA 93021 — (805) 279-7743 — 8 mi. Services: mobile testing, OBD testing. - **[Chatsworth Smog Check](https://ctcfinder.com/tester/chatsworth-smog-check-chatsworth/)** — 10034 Canoga Ave, Chatsworth, CA 91311 — (818) 489-9491 — 9 mi. Services: OBD testing, motorhome testing. - **[EcoTechWorld Inc](https://ctcfinder.com/tester/ecotechworld-inc-chatsworth/)** — 21356 Nordhoff St Suite 110, Chatsworth, CA 91311 — (323) 633-5490 — 9 mi. Services: mobile testing, OBD testing. - **[Prodigal Daughters Holding](https://ctcfinder.com/tester/prodigal-daughters-holding-chatsworth/)** — Chatsworth, CA 91311 — (760) 810-2656 — 9 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. - **[Woodys Automotive](https://ctcfinder.com/tester/woodys-automotive-chatsworth/)** — 21800 Lassen St Suite C, Chatsworth, CA 91311 — (323) 353-3797 — 9 mi. Services: mobile testing, OBD testing, motorhome testing. ## Trucking in Simi Valley Ventura County includes the Port of Hueneme in Oxnard and agricultural trucking in the Oxnard Plain and Santa Clara River Valley. ## 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 Simi Valley? CTC Finder lists 8 testing businesses in Simi Valley from CARB's public tester list (8 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 Simi Valley? Yes. 8 listed businesses in Simi Valley 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 Simi Valley? 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 - [Thousand Oaks](https://ctcfinder.com/testers/ventura-county/thousand-oaks/) — 3 listings, 7 mi - [Moorpark](https://ctcfinder.com/testers/ventura-county/moorpark/) — 4 listings, 8 mi - [Chatsworth](https://ctcfinder.com/testers/los-angeles-county/chatsworth/) — 4 listings, 9 mi - [Northridge](https://ctcfinder.com/testers/los-angeles-county/northridge/) — 3 listings, 13 mi - [Reseda](https://ctcfinder.com/testers/los-angeles-county/reseda/) — 5 listings, 13 mi - [Newbury Park](https://ctcfinder.com/testers/ventura-county/newbury-park/) — 3 listings, 13 mi - [Valencia](https://ctcfinder.com/testers/los-angeles-county/valencia/) — 5 listings, 14 mi - [Camarillo](https://ctcfinder.com/testers/ventura-county/camarillo/) — 5 listings, 17 mi - [Van Nuys](https://ctcfinder.com/testers/los-angeles-county/van-nuys/) — 11 listings, 18 mi - [San Fernando](https://ctcfinder.com/testers/los-angeles-county/san-fernando/) — 3 listings, 18 mi