Our Story
About Mobile Diesel Testing
We are a California mobile diesel emissions testing service specializing in commercial trucks, semis, box trucks, tow trucks, and diesel RVs. We bring certified testing equipment directly to your location so your fleet stays compliant and keeps moving.
California Mobile Testing
Who We Are
Mobile Diesel Testing was built around one straightforward idea: fleet operators shouldn't have to pull trucks off the road just to stay compliant. We serve commercial operators throughout California — coming to your yard, terminal, warehouse, or job site with everything needed to complete testing on-site.
We work with owner-operators running a single truck, mid-size fleets, and large commercial operations. Whatever the size of your fleet, we provide the same fast, thorough service with minimal disruption to your schedule.
Straightforward service
No upsells, no unnecessary delays. We show up, do the work, and get your vehicles back in service.
Safe for your equipment
We treat every vehicle with care. Our process is safe for paint and equipment — from a single diesel RV to a full commercial fleet.
Flexible scheduling
We work around your operation, not the other way around. Early mornings, fleet packages, and multi-vehicle visits all available.
Testing Services
What We Do
We perform three types of diesel emissions testing required for California compliance:
Diesel Smog Testing
Standard diesel smog inspection for commercial vehicles operating in California. Required for registration and compliance with state emissions standards.
OBD Testing (Onboard Diagnostics)
We connect to your vehicle's onboard diagnostic system to read emissions-related fault codes and confirm the vehicle's emissions controls are functioning correctly.
Opacity Testing
Opacity testing measures the visible smoke output from a diesel engine's exhaust. Excessive opacity indicates incomplete combustion or emissions system issues and is a key compliance metric for heavy-duty diesel vehicles.
Clean Truck Check Compliance
California's Clean Truck Check program requires periodic inspections for medium and heavy-duty diesel trucks. We perform the required testing on-site so your vehicles stay in compliance without leaving your yard.
The Mobile Advantage
Why Mobile Testing
Traditional testing stations require you to drive each vehicle to a fixed location — taking trucks off route, burning fuel, and costing time. For fleets with multiple vehicles, that adds up fast. Mobile testing eliminates that friction entirely. We come to you, test your vehicles where they sit, and hand you the documentation before we leave.