Expert Diesel Smog & Opacity Testing
Ensuring Compliance with Every Check
Mobile truck smog, OBD testing, and Clean Truck Check compliance for commercial trucks, semis, box trucks, tow trucks, diesel RVs, and fleets across California. We come to you.
Smog · OBD · Opacity · Clean Truck Check · Statewide California Service
On-Site Testing
What We Test
Smog, OBD, and opacity testing for every diesel vehicle — we bring the equipment to your yard, terminal, or job site.
Diesel RVs & Motorhomes
Full-size motorhomes and diesel pushers tested on-site at your campground, storage facility, or home.
Tow Trucks
Keep your fleet road-legal without pulling trucks off rotation. We test at your yard.
Box Trucks & Semis
Commercial trucks, semis, and delivery fleets tested at your yard, terminal, or warehouse.
All Diesel Vehicles
Any diesel-powered commercial vehicle — smog, OBD, and opacity testing performed on-site.
The Mobile Diesel Testing Difference
Why Choose Us
Fully Mobile
We come to your yard, terminal, warehouse, or job site. No towing, no scheduling conflicts, no lost work time.
Fast & Thorough
Smog, OBD, and opacity testing performed efficiently with minimal downtime. Your fleet keeps moving.
Safe for Your Equipment
Our process is safe for your paint and equipment. We treat every vehicle with care — from a single RV to a full commercial fleet.
Fleet Packages
Fleet packages available for operators of all sizes. One truck or fifty — we have a solution that works for your operation.
Zero Downtime
How It Works
Your trucks keep working while we test.
Schedule a Visit
Call or text us to book your on-site testing appointment. We work around your schedule.
We Come to You
Our technician arrives at your fleet yard, warehouse, or job site with all testing equipment.
Get Your Certificate
Testing is completed on-site. You receive your compliance documentation the same day.
Where We Operate
Serving All of California
We bring our testing equipment directly to your location — fleet yards, warehouses, storage facilities, and job sites throughout California.
Northern California
Bay Area, Sacramento, Central Valley, and surrounding regions.
Southern California
Los Angeles, San Diego, Inland Empire, and surrounding regions.
Central California
Fresno, Bakersfield, Stockton, and the Central Valley corridor.
Not sure if we cover your area? Give us a call — we'll let you know.
Schedule Your Test
Ready to Schedule?
510-589-8108Call or text to schedule your on-site diesel emissions test.
Available for fleets of all sizes — single vehicles to full commercial fleets.