Clean Truck Check in Oxnard, CA — Official CARB HD I/M Test Station
Diesel truck over 14,000 lbs? Get your CARB Clean Truck Check done for $99 by a certified technician — and if it fails, we diagnose and repair it in the same shop.
Mon–Fri 8am–5pm · Sat 9am–1pm · 2681 Ventura Blvd, Oxnard · Loaners & shuttle available
Test and repair under one roof
California's Clean Truck Check program — CARB's Heavy-Duty Inspection and Maintenance (HD I/M) program — requires periodic emissions testing for most non-gasoline vehicles over 14,000 lbs GVWR that operate in the state. That covers a lot of Ventura County: landscape and contractor trucks, box trucks on delivery routes, owner-operators and the ag and municipal vehicles that work the Oxnard Plain.
Dieter's Motors is an official Clean Truck Check test station, and a certified technician performs the test at our shop on Ventura Blvd. Newer trucks are typically tested through the onboard diagnostic (OBD) system; older engines get a smoke opacity and visual inspection. We do not offer mobile testing, so plan to bring the truck in. Bring the truck warmed up, with any active warning lights noted, and we'll tell you before the test if something looks likely to cause a failure.
The real advantage is what happens when a truck fails. Most testers can only hand you the result. We are also a full diesel repair shop, so we can diagnose the DPF, NOx sensor, SCR/DEF or exhaust fault, repair it and re-test without a week of towing between shops. Running several trucks? A fleet account adds compliance-deadline reminders and a reduced labor rate. We serve trucks from Oxnard, Camarillo, Ventura, Port Hueneme, Santa Paula and the rest of Ventura County.
Clean Truck Check testing, plus the repairs that get you compliant
Everything from the $99 test to the emissions repair a failed truck needs — handled by the same certified team.
Official HD I/M Test — $99
CARB Clean Truck Check performed by a certified technician at our Oxnard shop, with results submitted for your compliance record.
Pre-Test Check
Codes, warning lights and obvious exhaust issues checked first so your truck has the best chance of passing the first time.
DPF Faults
Diesel particulate filter restriction, failed regenerations and soot-related codes diagnosed and repaired.
NOx Sensors & SCR/DEF
NOx sensor failures, DEF quality and dosing problems and SCR efficiency codes traced with factory-level scan tools.
Exhaust Leaks & Opacity
Leaks, cracked components and high smoke-opacity readings found and fixed on older diesel engines.
Derates & Limp Mode
Check engine lights, power derates and limp mode that keep a truck off the road — or fail it on test day.
One price for the test. Repairs quoted first.
Testing is done at our shop at 2681 Ventura Blvd, Oxnard — we do not offer mobile testing.
Official CARB test by a certified technician for most non-gasoline vehicles over 14,000 lbs GVWR.
Reduced labor rate, priority scheduling and compliance-deadline reminders. Call & ask for Joel.
Who needs a Clean Truck Check
- Most non-gasoline vehicles over 14,000 lbs GVWR operating in California
- Landscapers, plumbers, electricians and general contractors
- Delivery, courier and box-truck fleets
- Owner-operators and single-truck businesses
- Agricultural and municipal vehicles
- Trucks showing a check engine light, derate or DPF warning before a test
Why truck owners test with us
- Test & repair, same shop A failure turns into a repair order here, not a tow to another shop and a second appointment.
- Certified tech on site The test is run by a certified technician at an official CARB HD I/M station.
- Diesel know-how ASE-certified technicians and factory-level diagnostic tools for modern emissions systems.
- Fleet accounts Reduced labor rate, priority scheduling and deadline reminders. Call & ask for Joel.
Based on online reviews from Ventura County drivers — many with us for decades.
“Been coming to Dieter's for over 15 years and they are the best — always straight shooters who go above and beyond with exemplary service.”
“Professional, informative, accurate and friendly. When issues arise, there's only one service center for me to call.”
“Outstanding, family-owned. Honest, thorough and knowledgeable. Large parts inventory, quick turnaround, fair prices.”
How much is a Clean Truck Check in Oxnard?
A Clean Truck Check (CARB HD I/M) test at Dieter's Motors is $99 per vehicle, performed by a certified technician at our shop at 2681 Ventura Blvd, Oxnard. If the truck fails, repairs are diagnosed and quoted before any work starts. Fleet accounts get a reduced labor rate on repairs — call (805) 485-1575 and ask for Joel.
Which vehicles need a Clean Truck Check?
CARB's Clean Truck Check applies to most non-gasoline vehicles over 14,000 lbs GVWR that operate in California, including diesel work trucks, box trucks and many owner-operator rigs. Gasoline vehicles and lighter trucks generally stay in the regular smog check program instead. If you are not sure where your vehicle falls, call us with the GVWR from the door sticker.
How often do I need a Clean Truck Check?
CARB sets the testing schedule, and it has been increasing as the program phases in, with deadlines tied to your vehicle's DMV registration. Owners also register vehicles in CARB's Clean Truck Check system and pay CARB's annual compliance fee separately. Check your notice from CARB or the CARB Clean Truck Check website for your exact due dates.
Do you offer mobile Clean Truck Check testing?
No. Clean Truck Check testing at Dieter's Motors is done at our shop only, at 2681 Ventura Blvd in Oxnard. The upside is that if your truck fails, it is already in a repair bay with a diesel technician and scan tools, so diagnosis can start right away instead of scheduling a second visit.
What happens if my truck fails the Clean Truck Check?
We explain the result and diagnose the cause. The usual culprits are DPF faults, NOx sensors, SCR or DEF system problems, exhaust leaks, high opacity readings and active check engine codes or derates. You get a written estimate, we repair it in the same shop, and then re-test so you can get back into compliance.
What is the difference between a smog check and a Clean Truck Check?
A regular smog check covers cars, vans and light trucks through the BAR smog program and costs $59 here. The Clean Truck Check is CARB's separate program for heavy-duty, non-gasoline vehicles over 14,000 lbs GVWR and costs $99 here. Dieter's Motors does both at the same Oxnard location.
Visit Dieter's Motors in Oxnard
Dieter's Motors2681 Ventura BlvdOxnard, CA 93036
Phone: (805) 485-1575
Free estimates on most cars.
Local shuttle service and loaner vehicles available while your car is in the shop. Serving Oxnard, Camarillo, Ventura, Port Hueneme, El Rio, Saticoy and all of Ventura County.
- Monday8:00 AM – 5:00 PM
- Tuesday8:00 AM – 5:00 PM
- Wednesday8:00 AM – 5:00 PM
- Thursday8:00 AM – 5:00 PM
- Friday8:00 AM – 5:00 PM
- Saturday9:00 AM – 1:00 PM
- SundayClosed