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Ontario

Emissions Testing in Ontario, California

Find 32 licensed smog check stations in Ontario. Browse test-only centers, STAR-certified locations, and shops offering registration renewal inspections. Requirements in California vary by vehicle type and model year.

32 stations
Ontario, CA
View California requirements
SS

Savon Smog Plus

4.8 · 104 reviews
Smog inspection station · 1125 W Holt Blvd Ste B, Ontario, CA 91762

Savon Smog Plus offers emissions testing and smog check services in Ontario, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
C

Comtires

4.8 · 384 reviews
Auto repair shop · 1113 W Holt Blvd, Ontario, CA 91762

Comtires offers reliable emissions testing and smog check services in Ontario, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
S&

S & E SMOG CHECK & OIL CHANGE

4.8 · 157 reviews
Smog inspection station · 2235 E 4th St suite h, Ontario, CA 91764

S & E SMOG CHECK & OIL CHANGE offers emissions testing and smog check services in Ontario, California. View hours and de...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
DS

DNV SMOG & CARB CLEAN TRUCK CHECK

4.7 · 223 reviews
Smog inspection station · 2315 S Euclid Ave, Ontario, CA 91762

DNV SMOG & CARB CLEAN TRUCK CHECK provides emissions testing and smog check services in Ontario, California. View hours...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
QC

Quick Check Smog Check

4.7 · 76 reviews
Smog inspection station · 10742 Central Ave, Ontario, CA 91762

Quick Check Smog Check offers emissions testing and vehicle inspection in Ontario, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
CT

Clean Truck Check Fontana

4.7 · 31 reviews
Smog inspection station · 3200 E Guasti Rd, Ontario, CA 91761

Clean Truck Check Fontana provides emissions testing and vehicle inspection services in Ontario, California. View hours...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
HS

Hector's Smog Check

4.7 · 72 reviews
Smog inspection station · 939 W State St STE E, Ontario, CA 91762

Hector's Smog Check offers emissions testing and vehicle inspections in Ontario California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
WA

Wayne's Automotive

4.6 · 157 reviews
Auto repair shop · 157 N Mountain Ave, Ontario, CA 91762

Wayne's Automotive offers emissions testing and smog check services in Ontario, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
T&

T & T Smog Test Only

4.5 · 38 reviews
Smog inspection station · 5490 W Mission Blvd, Ontario, CA 91762

T & T Smog Test Only offers emissions testing and smog check services in Ontario, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
JL

Jiffy Lube

4.5 · 624 reviews
Oil change service · 4567 Mills Cir, Ontario, CA 91764

Jiffy Lube offers emissions testing and smog check services in Ontario, California. View hours and details for vehicle i...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
PS

Pros smog check

4.5 · 2 reviews
Smog inspection station · 216 S San Antonio Ave, Ontario, CA 91762

Pros smog check offers emissions testing and vehicle inspection in Ontario, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
BP

B P Test Center

4.5 · 2 reviews
Smog inspection station · 11075 Central Ave, Ontario, CA 91762

B P Test Center offers smog check and vehicle inspection services in Ontario, California. View hours and details for emi...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis

City Guide

Emissions Testing in Ontario, California

Finding a reliable place for emissions testing or a smog check in Ontario is easier than ever. Our directory lists 32 licensed and verified emissions testing stations in the city, including STAR-certified and test-only centers where required. Whether you're renewing your registration or completing an out-of-state transfer, this page helps you quickly locate nearby inspection facilities and understand what applies in California.

Do Vehicles in Ontario Need an Emissions Test?

Most drivers in Ontario follow the same rules set by California. Requirements vary based on vehicle age, fuel type, and county. If you're unsure whether your ZIP code or vehicle model year requires a test, use this directory to browse local stations or review our state-specific testing requirements.

Types of Smog Check Services Available

  • Standard emissions tests for gasoline vehicles
  • OBD-II inspections for 1996+ model years
  • Tailpipe testing for older vehicles where required
  • Diesel emissions testing
  • Hybrid and electric vehicle smog checks
  • Registration renewal support
  • Test-only or STAR-certified inspections (state dependent)

Each listing includes the station's address, contact information, operating hours, and service notes to help you choose the right location.

Smog Check Tips for Ontario Drivers

Before heading to a testing center in Ontario, make sure:

  • Your check engine light is off
  • Your vehicle has completed recent drive cycles
  • The gas cap is properly sealed
  • The engine is fully warmed up
  • You have your registration and ID

Following these steps greatly increases the chance of passing on the first attempt.

Why Use This Directory?

Drivers in Ontario rely on this directory because it provides a complete list of verified emissions testing stations, map-based navigation for quick lookup, accurate state-updated requirements, support for gasoline, diesel, hybrid, and electric vehicles, and clear explanations of exemptions and frequency rules.

View California Requirements

Frequently Asked Questions About Emissions Testing in Ontario, California

Get answers to common questions about smog checks, testing requirements, and finding the right station in Ontario.

You can use this directory to find licensed emissions testing and smog check stations in Ontario. Browse the listings above to see addresses, contact details, and services offered, then choose the station that's most convenient for your part of the city.
It depends on California's emissions testing program, your registration ZIP code, and your vehicle's model year and fuel type. Some areas of California require testing, while others do not. Check your California state page in this directory or your DMV's website to see if your address in Ontario is in a testing area.
Most emissions programs require testing every one or two years, usually tied to registration renewal. Some vehicles are tested more frequently, and others are exempt for the first few model years. Use the California state page to see the current 2025 schedule for your vehicle type and registration area.
Prices vary by station and vehicle, but most emissions tests in Ontario fall within the typical range for California. Many stations list pricing by phone or on their website, and some offer coupons or discounts. Use the listings above to contact a station directly for current pricing.
Requirements depend on vehicle type (gasoline, diesel, hybrid, electric), model year, and weight, as well as where your vehicle is registered in California. In many states, fully electric vehicles are exempt, newer vehicles are temporarily exempt, and certain older or specialty vehicles may have different rules. Check the California state page for the latest 2025 requirements.
Most stations in Ontario ask you to bring your current registration or renewal notice, a valid photo ID, and proof of insurance if required by California. Make sure your vehicle is warmed up and the check engine light is off before you arrive.
If your vehicle fails, the station will provide a report showing the reason for failure (such as stored OBD-II codes or high tailpipe readings). In most programs, you must complete repairs and pass a retest before renewing your registration. Some states offer repair assistance, cost caps, or waivers. Details are listed on the California page in this directory.
In some states, certain vehicles are directed to specific station types (such as STAR or test-only centers). Unless your renewal notice or DMV instructions say otherwise, you can usually choose any licensed station in Ontario. If you're unsure, ask the station when you call or check the instructions on your renewal notice.

Can't find what you're looking for? Contact our customer support team