Precision Automotive Services
Clean Truck Check tester in Napa, CA (Napa County).
- Mobile testing
- OBD test
- Motorhomes
Precision Automotive Services appears on CARB's public list of credentialed Clean Truck Check testers with 2 credentialed testers at this business. It lists mobile testing, OBD testing, motorhome testing. Mobile testing means the tester can come to your yard or job site.
- Location
- 198 Soscol Ave, Napa, CA 94559
- County
- Napa County
- Phone
- (707) 912-9318
- Mobile testing
- Yes — comes to your yard
- OBD testing
- Yes
- Smoke opacity (non-OBD)
- No
- Motorhomes
- Yes
- Credentialed testers
- 2
- Last verified
Call (707) 912-9318 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 and any mobile trip fee. Typical published prices for an OBD test are $50–$135 per vehicle (see cost guide).
Which trucks Precision Automotive Services can test
The test CARB requires depends on the engine's fuel and model year. Based on the services Precision Automotive Services 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 Aaron Ramo in Napa, about 1 mile away. See listing.
Clean Truck Check testers in Napa County
Precision Automotive Services is one of 11 testing businesses in Napa County on CARB's public tester list. 11 of them offer mobile testing and 6 do smoke opacity tests. In Napa itself there are 11 listed businesses, 11 of them mobile. All testers in Napa 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 Precision Automotive Services 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 Precision Automotive Services offer mobile Clean Truck Check testing?
Yes. Precision Automotive Services says on CARB's tester list that it offers mobile testing, so it can come to your yard or job site. Ask about a trip fee when you call.
Can Precision Automotive Services test a 2012 or older diesel truck?
Precision Automotive Services does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is Aaron Ramo (about 1 mile). Trucks from 2013 on get an OBD scan instead.
How much does Precision Automotive Services charge for a Clean Truck Check?
Precision Automotive Services has not published prices with us; call (707) 912-9318 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 Precision Automotive Services a CARB-credentialed tester?
Precision Automotive Services 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 Napa
-
Aaron Ramo
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Jones Family Mobile Diesel Repair
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Mobile Testing
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Quick Smog
- Mobile testing
- OBD test
- Motorhomes
-
Steve DiPiero
- Mobile testing
- OBD test
- Smoke opacity
-
Williams Transmissions and Express Smog
- Mobile testing
- OBD test
- 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.