Cars & SUVs
Inspection inquiries for eligible passenger cars and SUVs.
GTO SMOG CHECK · MIRA LOMA, CA
The Goal? A Clean Pass.
Clean air. Clean cars. Fast • Honest • Reliable. Smog inspections for modern and classic vehicles.
Clean Air · Clean Cars / Fast · Honest · Reliable
Schedule your visit
Book Your Smog Check
Reserve a convenient time for your Smog Check with our Square online booking page. For older vehicles or special testing requirements, call us to confirm before your visit.
Book Appointment on Square ↗Appointments are handled securely on Square. You will leave this website to complete your booking.
What we do
Smog check services
Need a California Smog Check? Call to confirm your vehicle's inspection requirements, pricing and current availability.
Trucks & Diesel
Ask about testing requirements and services for your truck or diesel vehicle.
Hybrids & OBD
Testing requirements depend on model year, vehicle type and California rules.
The GTO identity
Vintage garage.
Modern mindset.
Our recognizable GTO emblem remains the main identity, paired with a circular secondary mark for merchandise and a dark matte-red garage aesthetic.
One brand · Two marks
Built to be recognized.
The original GTO Smog Check logo leads our website and signage. Our matching circular emblem carries the same identity into stickers, shirts and garage graphics.
A LITTLE CALIFORNIA HISTORY
Why Smog Checks Matter
California · Cleaner Air · Stronger Communities
California started its statewide Smog Check program in 1984 to help reduce pollution from cars and trucks. Since then, vehicle inspections have evolved from tailpipe measurements to modern onboard diagnostics. At GTO Smog Check, we appreciate both classic cars and newer technology—because cleaner air starts with every vehicle doing its part.
Testing requirements vary by vehicle year, type and location.
OLDER VEHICLE INSPECTIONS
Classic cars. Specialized smog testing.
Older California vehicles can require more than a diagnostic scan. Depending on model year, equipment, vehicle type and inspection area, your Smog Check may include fuel-vapor leak checks and a tailpipe emissions test with the engine running.
1976–1995
EVAP & Fuel-Cap Testing
For applicable gasoline vehicles equipped with evaporative-emissions controls, the inspection can include a fuel-cap integrity test and a low-pressure fuel evaporative test (LPFET).
- Fuel cap: A tester checks whether the cap properly seals and holds pressure.
- EVAP system: Where required, specialized equipment checks the fuel-vapor system for leaks at low pressure.
- Why it matters: Fuel vapors can escape even when the engine runs normally.
Requirements and exemptions depend on the vehicle. These tests are not automatically required on every pre-1996 vehicle.
1976–1999
Dyno / Loaded Emissions Test
Most applicable vehicles in California's Enhanced Smog Check areas undergo an Acceleration Simulation Mode (ASM) test on a chassis dynamometer, sometimes called a “rolling-road” test.
- Driving simulation: The drive wheels turn rollers while the vehicle is tested under a controlled load.
- Tailpipe readings: The analyzer measures pollutants including hydrocarbons (HC), carbon monoxide (CO) and oxides of nitrogen (NOx).
- Test modes: Applicable vehicles typically complete the 50/15 and 25/25 loaded test sequences.
Some vehicles cannot use a two-wheel dynamometer and may require a different procedure. In Basic areas, applicable vehicles generally receive a two-speed idle test instead.
Have a 1999 or older car?
Call (951) 790-1142
Call GTO Smog Check with your vehicle's year, make and model to confirm the appropriate inspection and equipment availability before visiting.
California BAR references: BAR-97 equipment requirements · Smog Check Manual · Reference Guide. Requirements vary by vehicle and inspection area.
CLEANER AIR · SMARTER SMOG CHECKS
Your catalytic converter matters.
A catalytic converter helps reduce harmful pollutants in vehicle exhaust. A missing, damaged, or non-compliant converter can prevent a vehicle from passing a California Smog Check.
Your vehicle may require a visual inspection and an emissions or onboard-diagnostics check, depending on its model year and test requirements. Replacement converters must meet applicable California requirements.
Book Your Smog CheckWhy it matters
Reduces emissions
Helps convert harmful exhaust pollutants into less harmful gases.
Part of the inspection
The converter may be checked for presence, condition, and compliance.
Protects clean air
A properly functioning emissions system supports cleaner communities.
See GTO in motion
The GTO experience
Classic cars. Modern smog testing.
From classic vehicles that may require EVAP and dynamometer testing to modern cars, GTO Smog Check is ready to help you understand the inspection your vehicle needs.
Call GTO Smog CheckMore from GTO Smog Check
COMING SOON · GTO SMOG CHECK
Special Offers & GTO Merch
Check back for upcoming smog check coupons and official GTO merchandise.
%
Coupons & Specials
New promotions are on the way. Check back for GTO Smog Check specials.
Coupons coming soon
GTO
GTO Merchandise
Represent GTO Smog Check. Shirts, hats and other merchandise are coming soon.
Merch store coming soonGTO automotive collection
Gallery
See our actual smog-check bay and vehicle testing, alongside GTO's custom automotive artwork and California Smog Check history graphics. Illustrated scenes are promotional concepts.
Customer feedback
Reviews on Google
We appreciate everyone who supports GTO Smog Check. Visit our Google Business Profile to read customer feedback or share your own experience.
See what customers are saying
Read reviews directly on Google. We haven't imported or invented star ratings or testimonials.
Find the shop
Visit GTO Smog Check
GTO Smog Check
5070 Etiwanda Ave
Mira Loma, CA 91752
Phone: (951) 790-1142
Hours (confirm before visiting)Mon–Fri: 9:00 AM – 5:00 PMSaturday: 9:00 AM – 2:00 PMSunday: Closed
Follow us on InstagramService offerings, hours, and the Google Business Profile link should be verified by the business owner before publishing. Map display requires an internet connection.