Jones Family Mobile Diesel Repair
Clean Truck Check tester in Napa, CA (Napa County).
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
Jones Family Mobile Diesel Repair appears on CARB's public list of credentialed Clean Truck Check testers. It lists mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing. Mobile testing means the tester can come to your yard or job site.
- Location
- 933 Water St, Napa, CA 94559
- County
- Napa County
- Phone
- (410) 301-8518
- Mobile testing
- Yes — comes to your yard
- OBD testing
- Yes
- Smoke opacity (non-OBD)
- Yes
- Motorhomes
- Yes
- Credentialed testers
- 1
- Last verified
Call (410) 301-8518 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 Jones Family Mobile Diesel Repair can test
The test CARB requires depends on the engine's fuel and model year. Based on the services Jones Family Mobile Diesel Repair 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 | Yes |
Clean Truck Check testers in Napa County
Jones Family Mobile Diesel Repair 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 Jones Family Mobile Diesel Repair 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 Jones Family Mobile Diesel Repair offer mobile Clean Truck Check testing?
Yes. Jones Family Mobile Diesel Repair 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 Jones Family Mobile Diesel Repair test a 2012 or older diesel truck?
Yes. Jones Family Mobile Diesel Repair 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 Jones Family Mobile Diesel Repair charge for a Clean Truck Check?
Jones Family Mobile Diesel Repair has not published prices with us; call (410) 301-8518 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 Jones Family Mobile Diesel Repair a CARB-credentialed tester?
Jones Family Mobile Diesel Repair 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 Napa
-
Aaron Ramo
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Mobile Testing
- Mobile testing
- OBD test
- Smoke opacity
- Motorhomes
-
Precision Automotive Services
- Mobile testing
- OBD test
- 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.