Hear from Our Customers
You’re running a business, not a fleet of paperweights. When your diesel trucks need CARB emissions testing, the last thing you can afford is pulling them off the road for half a day to sit at some testing facility across town.
Starting in 2025, California requires clean truck check testing for diesel and CNG trucks over 14,000 pounds GVWR—model year 2013 or newer. That means every truck in your fleet needs testing twice a year just to keep registration current. Miss it, and DMV puts a hold on your registration. Your truck doesn’t move. Your revenue stops.
We bring the test to you. Your trucks get tested on-site—at your yard, job site, or wherever they’re parked in Greater Los Angeles. The test takes about 15 minutes. Results upload to CARB immediately. You’re back in compliance without burning hours you don’t have.
All SMOG Motors is a CARB-accredited mobile testing service operating throughout Greater Los Angeles. Our testers are state-certified with over two decades of combined experience in diesel emissions testing and heavy-duty vehicle compliance.
We’re not some fly-by-night operation running tests out of a van. We’re insured, licensed, and credentialed by California Air Resources Board to perform official clean truck check testing. We’ve worked with construction companies, logistics fleets, towing operations, and waste management businesses across LA County.
You need someone who knows CARB truck regulations inside and out, shows up when they say they will, and doesn’t waste your time. That’s what we do.
You schedule a time that works for your operation—morning, afternoon, whatever keeps your trucks moving. We show up at your location anywhere in Greater Los Angeles with our mobile testing equipment.
Our certified tester performs a smoke opacity test and emissions control system inspection on each truck. This applies only to diesel and CNG vehicles over 14,000 pounds GVWR that are model year 2013 or newer. The test itself takes roughly 15 minutes per vehicle.
If your truck passes, we upload the results to CARB’s database immediately. Compliance updates in real-time, and you’re cleared for DMV registration renewal. If something doesn’t pass, we explain exactly what failed and what needs fixing—no charge for that conversation. You only pay when your truck passes, though travel fees may apply depending on location.
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You’re getting California CARB compliant testing without the hassle of traditional smog check stations. We test concrete mixers, dump trucks, roll-offs, semi trucks, reefers, box trucks, tankers, wheel lifts, flatbeds, and heavy tow trucks—anything over 14,000 pounds GVWR from 2013 forward.
Greater Los Angeles has some of the strictest air quality regulations in the country, and CARB diesel compliance isn’t optional anymore. Every diesel truck in your fleet needs testing twice a year. RVs and agricultural vehicles only need it once annually, but commercial trucks are on a tighter schedule.
We serve fleets of one truck or a hundred. If you’re running multiple vehicles, we offer fleet discounts because testing them all at once makes sense for everyone. We’ve cleared trucks at construction sites in downtown LA, logistics yards in Long Beach, and towing operations in the San Fernando Valley. We’re TSA-cleared to access airports and port terminals if that’s where your trucks operate.
The testing itself is straightforward—smoke opacity and emissions control system checks that meet CARB’s heavy-duty I/M testing standards. But the real value is keeping your operation moving while staying compliant with California regulations that can shut you down if ignored.
If your truck is a diesel or CNG vehicle with a gross vehicle weight rating over 14,000 pounds and it’s model year 2013 or newer, yes—you need it. California started enforcing clean truck check requirements in 2025, and DMV won’t renew your registration without proof of compliance.
This applies to commercial trucks, not light-duty pickups or older heavy-duty vehicles. If you’re running a semi, dump truck, concrete mixer, or any other heavy diesel rig in Greater Los Angeles, you’re required to test twice per year. RVs and agricultural trucks only need testing once annually.
The test is basically a smog check for heavy-duty diesel vehicles. CARB tracks compliance through their database, and when your test deadline approaches, you’ll need to pass before DMV processes your renewal. No compliance means no registration, and no registration means your truck sits.
The actual test takes about 15 minutes per truck. We’re not tearing anything apart or running lengthy diagnostics—it’s a smoke opacity test and emissions control system inspection. Quick and straightforward.
The bigger question is scheduling. We come to your location in Greater Los Angeles at a time that works for you. If you’ve got trucks parked overnight at your yard, we can test them early before they roll out. If you need us at a job site during the day, we can do that too.
Most of our customers appreciate that their trucks never leave the property. You’re not losing drive time, paying someone to shuttle vehicles across town, or dealing with testing facilities that are booked out for weeks. We show up, test your fleet on-site, and upload results immediately. Your trucks stay on schedule.
If your truck fails, we’ll explain exactly what didn’t pass and what needs to be addressed. Common issues include excessive smoke opacity, malfunctioning emissions control systems, or missing components that CARB requires for your truck’s model year.
You don’t pay for a failed test—you only pay when your truck passes. Travel fees may apply depending on where you’re located in Greater Los Angeles, but the test itself is only charged on a pass.
Once you’ve made the necessary repairs, we’ll come back and retest. Some operators choose to have their mechanic fix the issue first, others want our input on what’s actually wrong before spending money on repairs. Either way, we’re available to walk you through it. CARB regulations can be confusing, and we’d rather you fix the right thing the first time than waste money guessing.
We can test your entire fleet in one visit. If you’ve got five trucks or fifty, we’ll schedule a block of time and work through them all on-site. It’s faster for you and more efficient for us.
Fleet testing is common in Greater Los Angeles, especially for construction companies, logistics operations, and waste management businesses that run multiple heavy-duty vehicles. We offer fleet discounts because testing in volume makes sense.
The process is the same whether it’s one truck or twenty—we just allocate more time. Each vehicle gets tested individually, results upload to CARB immediately, and you get compliance verification for every truck that passes. If you’re managing a fleet, this is the simplest way to stay on top of California’s CARB truck regulations without pulling vehicles off the road one at a time.
We offer same-day service when availability allows, but most customers schedule a few days out to lock in a time that works for their operation. If you’re up against a registration deadline, call us—we’ll do what we can to get you in quickly.
Greater Los Angeles is a big service area, and we’re moving between job sites, fleet yards, and construction locations all day. The more notice you give us, the easier it is to route efficiently and get you a convenient time slot.
That said, we understand that compliance deadlines sneak up on people. CARB requires testing within a 90-day window before your deadline, and if you’re just realizing your registration is due, we’re not going to leave you stuck. Reach out and we’ll figure it out.
Because your truck doesn’t leave your property, you don’t lose hours of productivity, and you’re not dealing with testing stations that may not even be equipped for heavy-duty diesel vehicles over 14,000 pounds GVWR.
A lot of traditional smog check locations in Los Angeles don’t handle clean truck check testing. The ones that do are often booked out or located far from where your trucks actually operate. Driving a semi or dump truck across town just to sit in line at a testing facility is a waste of time and fuel.
We bring CARB-certified testing directly to you. Your driver doesn’t need to take the truck anywhere. You don’t lose a half-day of work. Results upload immediately, and compliance is verified in real-time. For commercial operators in Greater Los Angeles who can’t afford downtime, mobile testing isn’t just more convenient—it’s the only option that makes sense.
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