📍 Tracy · Livermore · Antioch · Concord · 209/925

Mobile CARB
Diesel Testing
for the 209

Amazon distribution. Crate & Barrel. Ulmar Supply. Motorhome fleets. Construction yards. We bring certified CARB testing to your location — OBD $75 · OVI Smoke $199. No shop trips. CARB fines up to $10,000/day.

Book a Test 📞 Call 916-890-4427
$75
OBD Test (2013+)
$199
OVI Smoke (2012−)
24/7
Available Now
Same-Day
Often Available
$0
Travel Fees
Who We Test

Built for the 209 Industrial Corridor

From the Amazon distribution hub in Tracy to the Ulmar Supply yards — we test them all, on-site, 24/7.

📦
Distribution Centers
Amazon, Crate & Barrel, UPS, FedEx, regional warehouses
🏗️
Industrial Supply
Ulmar Supply & similar industrial, building materials, wholesale
🚐
Motorhomes & RVs
Diesel motorhomes, Class A & C, dealerships & fleets
🚛
Trucking & Freight
Owner-operators, carriers, LTL fleets throughout the 209
🌾
Agriculture
Farm equipment, tractors, harvest rigs in the Central Valley
⚒️
Construction
Excavators, dump trucks, graders — on-site testing
Flat Rate Pricing

Two Tests. No Hidden Fees.

We quote upfront, test on-site, file directly with CARB. What you see is what you pay.

OBD On-Board Diagnostics
$75
2013 & newer diesel engines
  • Full CARB-compliant OBD scan
  • Direct CARB filing included
  • Results in ~20 minutes
  • Distribution, ag, construction fleets
  • We come to your yard or dock
OVI Smoke Opacity Test
$199
2012 & older diesel engines
  • SAE J1667 snap-acceleration method
  • Calibrated opacity meter on-site
  • Written test report same day
  • CARB reporting included
  • Motorhomes, older trucks, equipment
Fleet Block Rate
Ask Us
5+ vehicles — call for quote
  • Discounted per-unit pricing
  • Single mobilization fee
  • Mixed OBD + OVI OK
  • Distribution center scheduling
  • Call 916-890-4427
🔄
Free Retest Guarantee
Fail a test we conduct? We come back and retest free. No charge, no argument, no fine print.
💵
$40 Cash Referral
Send a fleet or truck our way — collect $40 cash when they test. Get 10 referrals, that's $400 in hand.
🚗
Zero Travel Fees
Flat rate across the entire 209/925 corridor. No mileage, no fuel surcharge — ever.
Schedule Your Test

Book Online or Call Direct

📦
Distribution Center Specialists
We coordinate with dock managers, work around shift changes, and test multiple trucks in a single visit at Amazon, Crate & Barrel, Ulmar, and similar facilities.
🚐
Motorhome & RV Testing
Diesel motorhome CARB testing at your storage facility, dealership, or driveway. We know Class A and C diesel requirements cold.
⚡
Same-Day Available
Need it fast? We often have same-day openings in the 209/925. Text or call 916-890-4427 any time.
📋
CARB Files Directly
We submit results electronically. You get a written report same day. CARB credential #IF530523 on file.
Please select a year range.
Please select a vehicle type.
Please enter a valid phone number.
Please enter your ZIP code.

✅ Free retest if you fail · We confirm by phone within 2 hours
Or call direct: 916-890-4427

Where We Roll

209 · 925 · Tri-Valley · Central Valley

Based in the 209 — covering the full industrial corridor from Stockton/Lodi south through Tracy, across the 205 to Livermore, and up Hwy 4 through Brentwood, Antioch, and Concord.

Tracy
Livermore
Antioch
Concord
Stockton
Lodi
Brentwood
Manteca
Modesto
Pittsburg
Oakley
Pleasanton
Dublin
Mountain House
Discovery Bay
Turlock
I-580/205 I-5 Hwy 4 I-680 TRACY STOCKTON LIVERMORE ANTIOCH CONCORD MODESTO MANTECA LODI Primary Zone Tri-Valley / East Bay Extended Range
From the 209

What Our Customers Say

★★★★★

"We have 30+ diesel trucks rolling out of our Tracy distribution yard. They staged testing between shifts — zero downtime. Professional and fast."

Operations Manager
Distribution Center — Tracy, CA
★★★★★

"Got my Class A diesel motorhome tested right in the driveway. They knew exactly what was needed, filed everything with CARB same day. Couldn't be easier."

R. Faulkner
Motorhome Owner — Livermore, CA
★★★★★

"Called Saturday morning with a CARB notice, they tested our whole supply fleet in Antioch by noon. Would have been a nightmare otherwise."

D. Santos
Industrial Supply Fleet — Antioch, CA
★★★★★

"Six old-engine tractors on our Lodi farm — all OVI smoke tests done in one visit. No travel fee, honest price, no BS. That's rare."

T. Yamamoto
Yamamoto Farms — Lodi, CA
★★★★★

"Referred three other carriers in Concord and got $120 cash. Easy money. And they took care of those guys just as well as they took care of us."

M. Cortez
Cortez Freight — Concord, CA
Common Questions

209 / 925 FAQ

Do you test Amazon distribution center fleets in Tracy?
Yes — large distribution center fleets are a specialty. We coordinate with your dock manager, test between shifts, and handle any number of vehicles in a single visit. We serve Tracy, Livermore, Antioch, Concord, and all surrounding distribution hubs.
Can you test diesel motorhomes and RVs?
Yes. Diesel motorhomes subject to CARB requirements can be tested on-site at your storage facility, dealership lot, or home driveway. We know Class A and C diesel requirements. Call 916-890-4427 and we'll confirm what test your motorhome needs.
What test does my diesel vehicle need — OBD or Smoke?
2013 and newer: OBD test at $75. 2012 and older: OVI Smoke Opacity Test at $199. Not sure? Call 916-890-4427 and we'll determine the right test for your engine in minutes.
How fast can I get tested in the 209?
We often have same-day or next-morning availability throughout Tracy, Livermore, Antioch, Concord, and Stockton. Text or call 916-890-4427 any time — we're 24/7.
Is there a referral program?
Yes — $40 cash in hand every time someone you refer gets tested with us. Get 10 referrals and that's $400. No cap, no minimum. Call or text to tell us you're referring someone and we'll track it.
What's the free retest guarantee?
If your vehicle fails a test we conduct, we come back and retest it free of charge after you've had it serviced. No re-mobilization fee, no argument. We stand behind our testing.
Are there any travel or trip fees?
None. Flat rate pricing — period. No fuel surcharge, no mileage fee, no "trip charge." What we quote is what you pay, anywhere in the 209/925 service area.

CARB fines start at $1,000/day per vehicle.

One call to 916-890-4427 and we handle the rest — same day, at your location, flat rate.

Book Online 📞 Call 916-890-4427
📞 Tap to Call or Text 24/7 · 916-890-4427