California
Ontario

ONTARIO SMOG

Smog inspection station
Opens at 9:00 AM
4.9 (113 reviews)
152 N Mountain Ave, Ontario, CA 91762
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About

Ontario Smog is a provider of smog check and emissions testing services in Ontario, California. They specialize in vehicle inspection and diagnostics to ensure your vehicle meets emissions standards. Customers appreciate the quick and professional testing experience, often being in and out in less than 30 minutes. The shop has a reputation for thorough and accurate results, backed by many positive reviews. Service style may vary but generally includes friendly staff and competitive pricing. Ontario Smog focuses on emissions-related testing and repairs, helping drivers pass strict California regulations efficiently.

smog check vehicle inspection OBD testing Ontario California emissions testing

Services Offered

smog check
Vehicle Inspection
OBD-II Diagnostics
Check Engine Light Diagnosis
Catalytic Converter Service
Exhaust Repair
O2 Sensor Replacement

What Customers Say

Review Summary

Customers generally find Ontario Smog to be a reliable and efficient option for their emissions testing needs. Many mention the quick service times and friendly staff, which help reduce wait times and make the process smooth. Some reviewers note that the pricing is fair, reflecting the thoroughness of the inspection. While service style may vary, most customers leave satisfied with the professionalism and honesty of the staff. During busy periods, there may be wait times, but overall, the shop provides a positive testing experience with consistent quality.

152 N Mountain Ave, Ontario, CA 91762 +1 909-986-6655 Visit Website
Hours Closed
Mon 9 am–5 pm
Tue 9 am–5 pm
Wed • 9 am–5 pm
Thu 9 am–5 pm
Fri 9 am–5 pm
Sat 9 am–2 pm
Sun Closed
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Frequently Asked Questions

Discover quick and comprehensive answers to common questions about our platform, listings, and services.

Ontario Smog is located at 152 N Mountain Ave, Ontario, California. You can visit during their hours of operation listed on their website.
Ontario Smog offers smog check, vehicle inspection, diagnostics, emissions-related repairs, and related services in Ontario, California.
Yes, Ontario Smog provides emissions testing and smog check services to help you meet California emission standards.
Their operating hours are Monday to Saturday from 9 am to 5 pm, and they are closed on Sundays.
You can contact Ontario Smog by calling +1 909-986-6655 or visiting their website for more information.
Appointments are not required; you can walk in during their business hours for a smog check or inspection.
Service times typically range from 15 to 30 minutes depending on the vehicle and testing process.
Customers often praise Ontario Smog for their quick, professional service and friendly staff, making emissions testing a straightforward experience.

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

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Making the Most of Your Visit to ONTARIO SMOG

Choosing the right emissions testing or smog check station in Ontario, California can save you time, reduce stress, and help ensure your vehicle passes its inspection on the first try. ONTARIO SMOG is one of the licensed smog check locations in the area, and preparing properly before your visit can make the process smoother.

Understanding California Smog Check Requirements

Emissions testing and smog check rules in California vary by vehicle type, registration ZIP code, and model year. Since requirements can differ even within Ontario, confirm what applies to you before heading to ONTARIO SMOG. Our California emissions testing guide outlines current 2025 rules, exemptions, and testing intervals.

Before Your Smog Check

To help make your emissions test quick and successful, consider preparing the following:

  • Confirm your registration address requires testing.
  • Ensure your check engine light is off and no recent codes have been cleared.
  • Warm up your vehicle by driving 10 to 15 minutes before testing.
  • Bring your registration or renewal notice and a valid photo ID.

Why Reviews Matter

Customer experiences can vary, so reading feedback from other drivers can help you understand what to expect. ONTARIO SMOG currently has 113 reviews, which can provide insights into service quality, wait times, and professionalism.

"Clear communication and preparation make your smog check easier. Ask ONTARIO SMOG about wait times, retest policies, or emissions repair services if you have concerns."

Visit Checklist

  • 1
    Verify Certification

    Ensure ONTARIO SMOG is an active, licensed smog check station in California.

  • 2
    Check Reviews

    Read recent customer feedback from other Ontario drivers to understand typical wait times and service quality.

  • 3
    Confirm Services

    Call ahead to confirm the types of smog checks and emissions tests offered and whether appointments are required.

  • 4
    Bring Required Documents

    Have your registration or renewal notice, ID, and any required paperwork ready when visiting the station.

  • 5
    Ask About Retest Policies

    Some stations offer discounted or free retests if your vehicle fails. Ask for details up front.

* This guide is for informational purposes only. Always confirm emissions testing requirements and smog check policies with your local California authorities.