Steven's Bay Area Diesel
Clean Truck Check tester in South San Francisco, CA (San Mateo County).
- OBD test
- Smoke opacity
Steven's Bay Area Diesel appears on CARB's public list of credentialed Clean Truck Check testers. It lists OBD testing, smoke opacity (non-OBD) testing.
- Location
- 480 Littlefield Ave, South San Francisco, CA 94080
- County
- San Mateo County
- Phone
- (650) 290-3703
- Mobile testing
- No (test at the shop)
- OBD testing
- Yes
- Smoke opacity (non-OBD)
- Yes
- Motorhomes
- No
- Credentialed testers
- 1
- Last verified
Call (650) 290-3703 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 Steven's Bay Area Diesel can test
The test CARB requires depends on the engine's fuel and model year. Based on the services Steven's Bay Area Diesel 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 | Yes |
| California-registered motorhome | Same test as above by engine year, once a year | Not listed |
If you need a tester at your yard, the nearest listed tester that offers mobile testing is Mobile Golden State Emissions Testing South City in South San Francisco, about 1 mile away. See listing.
Clean Truck Check testers in San Mateo County
Steven's Bay Area Diesel is one of 31 testing businesses in San Mateo County on CARB's public tester list. 27 of them offer mobile testing and 17 do smoke opacity tests. In South San Francisco itself there are 5 listed businesses, 2 of them mobile. All testers in San Mateo 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 Steven's Bay Area Diesel 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 Steven's Bay Area Diesel 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 Mobile Golden State Emissions Testing South City (about 1 mile).
Can Steven's Bay Area Diesel test a 2012 or older diesel truck?
Yes. Steven's Bay Area Diesel lists smoke opacity testing, the test CARB requires for diesel trucks of model year 2012 and older (no OBD). See OBD vs smoke opacity.
How much does Steven's Bay Area Diesel charge for a Clean Truck Check?
Steven's Bay Area Diesel has not published prices with us; call (650) 290-3703 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 Steven's Bay Area Diesel a CARB-credentialed tester?
Steven's Bay Area Diesel appears on CARB's public Clean Truck Check tester list, 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 South San Francisco
-
Mobile Golden State Emissions Testing South City
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Steve Eftimiou
- OBD test
- Smoke opacity
-
Steve Skrivanek
- OBD test
- Smoke opacity
-
Truck N go
- Mobile testing
- OBD test
-
Ernesto Gutierrez
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
JTL Mobile CARB Testing
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
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.