Downey Smog CORP
Clean Truck Check tester in Downey, CA (Los Angeles County).
- OBD test
- Motorhomes
Downey Smog CORP appears on CARB's public list of credentialed Clean Truck Check testers with 2 credentialed testers at this business. It lists OBD testing, motorhome testing.
- Location
- 10801 Studebaker Rd, Downey, CA 90241
- County
- Los Angeles County
- Phone
- (562) 863-4085
- Mobile testing
- No (test at the shop)
- OBD testing
- Yes
- Smoke opacity (non-OBD)
- No
- Motorhomes
- Yes
- Credentialed testers
- 2
- Last verified
Call (562) 863-4085 Open in Google Maps
Before you call
- Have your VIN, odometer reading and plate number ready.
- Your vehicle must be registered in CTC-VIS and the annual compliance fee paid; the tester submits the result to CARB.
- Ask for the price per vehicle. Typical published prices for an OBD test are $50–$135 per vehicle (see cost guide).
Which trucks Downey Smog CORP can test
The test CARB requires depends on the engine's fuel and model year. Based on the services Downey Smog CORP lists on CARB's tester list:
| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Yes |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Yes |
| Diesel, model year 2012 or older (no OBD) | Smoke opacity test (SAE J1667) plus visual inspection | Not listed |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |
For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Itch Vargas in Downey, about 1 mile away. See listing.
If you need a tester at your yard, the nearest listed tester that offers mobile testing is Itch Vargas in Downey, about 1 mile away. See listing.
Clean Truck Check testers in Los Angeles County
Downey Smog CORP is one of 516 testing businesses in Los Angeles County on CARB's public tester list. 465 of them offer mobile testing and 190 do smoke opacity tests. In Downey itself there are 9 listed businesses, 7 of them mobile. All testers in Los Angeles County.
When your truck is due
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. You can test up to 90 days before a deadline. Get a free email reminder before each one.
How to check a tester's credential
CARB publishes its Clean Truck Check tester list, where Downey Smog CORP appears as of November 1, 2026. Listing there is optional, so a missing name does not always mean a tester is not credentialed. After the test, check that the passing result shows for your vehicle in CTC-VIS; that is what counts for compliance.
Frequently asked questions
Does Downey Smog CORP offer mobile Clean Truck Check testing?
Not according to CARB's tester list; plan to bring the truck to the tester. The nearest listed mobile tester is Itch Vargas (about 1 mile).
Can Downey Smog CORP test a 2012 or older diesel truck?
Downey Smog CORP does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is Itch Vargas (about 1 mile). Trucks from 2013 on get an OBD scan instead.
How much does Downey Smog CORP charge for a Clean Truck Check?
Downey Smog CORP has not published prices with us; call (562) 863-4085 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the cost guide.
Is Downey Smog CORP a CARB-credentialed tester?
Downey Smog CORP appears on CARB's public Clean Truck Check tester list with 2 credentialed testers, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.
Other testers near Downey
-
Itch Vargas
- Mobile testing
- OBD test
- Smoke opacity
-
Rivera truck repair
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Eagle Smog
- OBD test
- Motorhomes
-
OG services
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Onsite Fleet Mobile Compliance
- Mobile testing
- OBD test
-
Osvaldo Delmuro
- Mobile testing
- OBD test
Source: CARB's public Clean Truck Check tester list, last checked . Listing on CARB's list is optional for testers, so some credentialed testers are not shown. Services, hours and prices change; please confirm with the tester before you go. Something wrong? Send a correction.