Why Fairfield Is the Clean Truck Check Hub for Northern California

Fairfield is the geographic and industrial center between Sacramento and Oakland, with direct access to major trucking and distribution routes. Fleets operating along I-80 are considered high-priority enforcement targets by CARB due to regional air quality mandates.

We support trucks servicing:

• Port of Oakland freight routes

• Sacramento Valley agriculture

• Napa and Suisun wine transport

• Vacaville and Dixon logistics and manufacturing fleets

• Davis bio-agricultural distribution

• Interstate 505 connection to Dunnigan & I-5

CARB Testing Services

OBD Clean Truck Check (HD I/M)

• Required by CARB for 2007+ diesel engines

• Mobile plug-in diagnostics completed on-site

• Certificates submitted same day to CARB

J1667 Opacity Smoke Test

• Required for trucks not eligible for OBD testing or with failing OBD status

• Performed with CARB-approved Wager 6500 meter

• Agriculture and exempt-use vehicles verified on-site

Free Retest within 30 Days

If repairs are needed, we provide one free retest to ensure compliance before deadlines.

Industries We Serve Across the Fairfield Corridor

This region includes major freight, agricultural, and industrial fleets. We provide mobile testing for:

• Distribution centers and warehouse fleets

• Agricultural hauling (grapes, almonds, produce)

• Napa and Suisun vineyard transport trucks

• Bulk liquid and tanker fleets

• Construction and grading equipment transport

• Municipal and utility fleets

• Manufacturing and material supply fleets

• Interstate trucking and long-haul carriers using I-80 and I-505

Counties and Cities We Cover

Primary Hub: Fairfield, CA
Direct Service Areas Include:

• Vacaville

• Dixon

• Davis

• Napa

• American Canyon

• Suisun City

• Woodland

• Dunnigan (I-505 & I-5 interchange)

• Winters, Elmira, and surrounding rural operation zones

If your truck operates anywhere within Solano, Yolo, Napa, or Sacramento County, we provide mobile CARB Clean Truck Check service at your location.

Why Mobile Testing Is Essential

CARB has increased enforcement in the I-80 freight corridor. Fleets failing to meet testing deadlines face:

• DMV registration holds

• Daily fines

• Compliance audits

• Operational interruptions

Our mobile testing ensures your fleet stays compliant, active, and operating legally in California air districts.

Schedule Your On-Site Clean Truck Check

Phone: 916-890-4427
Text (24/7):
Email: Bryan@norcalcarbmobile.com

Testing available as early as 5:00 AM and after-hours to avoid fleet downtime.

Frequently Asked Questions

Do you test fleets in Vacaville and Dixon?

Yes. Fairfield is our hub location, and mobile units service Vacaville, Dixon, Davis, Napa, Woodland, and all rural agricultural and industrial fleets in the area.

Do I need to drive to a shop?

No. All testing is performed mobile and on-site.

What if my fleet includes both newer and older trucks?

We perform both OBD tests and opacity smoke tests during the same visit.

Customer Reviews

"Our produce hauling operation in Dixon relies on NorCal CARB Mobile to keep us compliant during harvest season. Mobile testing allowed us to stay on schedule with zero disruption to transport."
— Fleet Manager, Dixon Agricultural Hauling

"They tested our distribution fleet in Fairfield before our CARB deadline. Certificates were submitted same day and we avoided DMV delays."
— Operations Director, Fairfield Logistics