Stephen Young
Clean Truck Check tester in Santa Rosa, CA (Sonoma County).
Stephen Young appears on CARB's public list of credentialed Clean Truck Check testers.
- Location
- Santa Rosa, CA 95407
- County
- Sonoma County
- Phone
- (707) 249-3787
- Mobile testing
- No (test at the shop)
- OBD testing
- No
- Smoke opacity (non-OBD)
- No
- Motorhomes
- No
- Credentialed testers
- 1
- Last verified
Call (707) 249-3787 Open in Google Maps
The street address is not published for this listing (mobile or home-based tester). Call to arrange the test.
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 Stephen Young can test
The test CARB requires depends on the engine's fuel and model year. Based on the services Stephen Young lists on CARB's tester list:
| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Not listed |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Not listed |
| 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 | Not listed |
For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Chris Patterson in Santa Rosa, about 1 mile away. See listing.
If you need a tester at your yard, the nearest listed tester that offers mobile testing is Chris Patterson in Santa Rosa, about 1 mile away. See listing.
Clean Truck Check testers in Sonoma County
Stephen Young is one of 28 testing businesses in Sonoma County on CARB's public tester list. 19 of them offer mobile testing and 14 do smoke opacity tests. In Santa Rosa itself there are 17 listed businesses, 11 of them mobile. All testers in Sonoma 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 Stephen Young 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 Stephen Young 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 Chris Patterson (about 1 mile).
Can Stephen Young test a 2012 or older diesel truck?
Stephen Young does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is Chris Patterson (about 1 mile). Trucks from 2013 on get an OBD scan instead.
How much does Stephen Young charge for a Clean Truck Check?
Stephen Young has not published prices with us; call (707) 249-3787 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 Stephen Young a CARB-credentialed tester?
Stephen Young 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 Santa Rosa
-
Chris Patterson
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Donahue Truck Centers
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Juan Torres
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Karamjit Singh Kaleka
-
Lovepreet Singh
- OBD test
- Smoke opacity
- Motorhomes
-
Morgan Dirt Solutions
- 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.