California Smog Check Rules: What You Need to Know (2024)

The Smog Check Program is conducted by the California Department of Consumer Affairs’ Bureau of Automotive Repair (BAR) to identify vehicles with surplus emissions so they do not pose a threat to the environment.

Here’s what you need to know about smog checks in California:

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What Vehicles Require a Smog Check?

All hybrid vehicles, gasoline-powered vehicles, and alternative fuel vehicles that are 1976 model or newer require a smog check. Diesel-powered vehicles that are 1998 model or newer with a gross weight of 14,000 pounds and less will need a smog check. Exceptions to this rule are:

  • If your vehicle is an eight-year model or newer, it won’t need every other year inspection.
  • Change-of-ownership for vehicles that are four-year models or newer.
  • Electric-powered vehicles and motorcycles.

What Are the Elements of a Smog Check?

The main elements of a smog check are:

  • Inspecting the emission control components of the vehicle visually.
  • Functional inspection of the vehicle’s ignition timing, engine light, exhaust gas recirculation system, gas cap, and fuel evaporative system.
  • Inspecting the On-Board Diagnostic (OBD) system of the vehicle functionally.
  • Inspection of the tailpipe emissions.

Also Read – 7 Easy Ways to Keep Your Car Running Forever

Is Smog Check Required in California?

In California, smog checks are mandatory every other year for vehicles that are more than eight years old. Apart from this, if you are selling a vehicle that is more than four years old or want to register an out-of-state vehicle for the first time in California, you will need a smog check.

How Often Do You Need a Smog Check in California?

Most vehicles in California need to pass a smog check biennially for registration renewal.

How Does a Smog Check Work in California?

During a smog check, a licensed technician will attach a measuring device to your vehicle, which can clear out the pollutants from your car’s exhaust pipe. The measurements taken are recorded and made available to your state’s agency responsible for monitoring vehicle emissions.

Also Read – A Car Tune-Up Checklist to Keep Your Vehicle Running Smoothly

What Happens If You Fail the Smog Test in California?

If your vehicle fails the smog test, your car will not be allowed to drive on the streets.

Can You Sell a Car Without a Smog Check in CA?

If you want to sell a car without a smog check in CA, you will need explicit permission from the Department of Motor Vehicles, California. The only other option is to create an agreement between the seller and buyer stating that they both agree the vehicle may not be able to clear a smog test.

Also Read – Power Brakes Vs. Anti-Lock Brakes: What’s the Difference?

How Can You Help Your Vehicle Pass a Smog Check?

The best way to ensure that your car will pass a smog check is to perform proper and regular maintenance. Do not tamper with the emissions-control equipment of the vehicle. Take your car to a licensed auto repair shop immediately if it flashes the “check engine” light.

Preparing for Your Smog Check

To ensure your vehicle passes the smog check, it’s important to prepare it properly. Regular maintenance is key. This includes changing the oil, checking the air filter, and ensuring your tires are properly inflated, as these can all affect your vehicle’s emissions. If your ‘check engine’ light is on, address this issue before the smog check, as it’s an automatic fail. Vehicles often fail because of small issues that could have been easily fixed beforehand.

Understanding Exemptions and Extensions

While most vehicles in California require a smog check, there are exceptions. For instance, electric vehicles, motorcycles, trailers, and vehicles older than 1975 are exempt from smog checks. Additionally, if you’re a military member stationed outside of California, you may qualify for a smog check exemption. It’s important to understand these exemptions to know whether they apply to your vehicle.

The Impact of Failing a Smog Check

Failing a smog check means your vehicle cannot be legally driven or sold until it passes. If your vehicle fails, you will receive a report detailing why. Common reasons include high emissions levels and malfunctioning components affecting the emissions system. You’ll need to have these issues repaired and then have the vehicle retested. In some cases, financial assistance is available through the Consumer Assistance Program (CAP) for repairs.

Selling a Vehicle in California

When selling a vehicle in California, it’s the seller’s responsibility to provide the buyer with a valid smog certification at the time of sale. This certification must be obtained no more than 90 days before the sale. If you’re buying a vehicle, ensure the seller provides you with this certification. Without it, the transfer of ownership could be delayed or complicated.

Why Choose A-Z Tech Automotive for Your Smog Check

At A-Z Tech Automotive, we are committed to making your smog check experience as smooth and stress-free as possible. Our certified technicians use the latest equipment to ensure accurate and efficient testing. We understand the importance of adhering to California’s environmental standards and are here to help you keep your vehicle compliant. If you need a smog check or have any questions about the process, contact us or schedule an appointment today. Let us help you keep your vehicle running cleanly and efficiently.

If you are looking for a smog check of your vehicle, A-Z Tech Automotive is here to help. You can call us at (949) 472-8111 directly or book an appointment online and schedule your auto maintenance services.

California Smog Check Rules: What You Need to Know (2024)

FAQs

California Smog Check Rules: What You Need to Know? ›

Gasoline-powered vehicles, hybrid vehicles, and alternative-fuel vehicles that are model-year 1976 and newer require a Smog Check, with the following exceptions: Eight model years and newer do not require a biennial Smog Check. Four model years and newer do not require a change-of-ownership Smog Check.

What will fail a CA smog test? ›

Vehicles can fail a Smog Check for any number of reasons, some common reasons for failing a smog check include: Excessive tailpipe emissions. Modified with non-approved parts or computer programing. Check Engine light or OBD monitor failures.

What do you need to pass a smog check in California? ›

The main and most common categories that must be passed are, Catalytic Converter, Evaporative Emissions, Oxygen Sensor, Oxygen Sensor Heater, Exhaust Gas Recirculation System, Misfire, Secondary Air Injection, and Fuel System.

How do I prepare for a smog check? ›

Here are the top tips from our experts to prepare your car for a smog check:
  1. Clear that "Check Engine" light. ...
  2. Drive the car at highway speeds for the two weeks prior to the smog test. ...
  3. Change the oil, but only if it needs it. ...
  4. Do a tune-up two weeks before the smog test. ...
  5. Make sure the tires are properly inflated.

What is an exception to a CA smog check? ›

Your vehicle does not need a smog inspection if your:

Powered by natural gas and weighs more than 14,000 pounds. An electric vehicle. Gasoline-powered and less than eight model-years old.

Why would a car not pass smog test? ›

Do you know the #1 reason that cars don't pass their smog check? According to Diamond Certified smog check experts, a “check engine” / “service engine soon” light ON and/or high tail pipe emissions are the main reasons.

Can a car pass smog if the check engine light is on? ›

Note: No car will pass a smog test if the Check Engine light is on. If you take your car in for a test with the Check Engine light on, you will fail. Be sure to take your car to the mechanic when the light turns on, and before taking it in for a test so you don't waste your time.

How hard is it to pass California smog test? ›

California takes air quality seriously, which is why all vehicles in the state (even hybrids) are required to pass regular smog tests. California's emissions standards are some of the strictest in the country, and about 10 percent of vehicles fail.

Will CA give you 1200 if your car does not pass smog? ›

Eligible consumers may receive up to $1,200 in emissions-related repairs at a STAR test-and-repair station if their vehicle fails its biennial Smog Check inspection.

How can you increase your chances of passing smog? ›

Regularly perform oil changes and tuneups and be sure your tires are properly inflated. Then, when a smog test is required, you'll be ready. You can also try using a fuel injector cleaner, which can help clean carbon deposits from your engine and reduce emissions.

What not to do before a smog check? ›

When you arrive to have a vehicle smog check, your car should be warmed up. If it's not, there's a chance you could fail your car smog check simply because your car isn't ready for it. To prevent this from happening, drive your car for between 10 and 15 miles before having a vehicle smog check done.

Should I change oil before smog check? ›

It has been proven to be effective, get your oil change before your next smog test. Having your check engine light on is an automatic failure. Whether it's a glitch in your cars computer, or your mechanic says its okay, by law you will still fail your smog check.

Can you pass smog with check engine light on in California? ›

If your check engine light is on, your car will fail the smog test in California every time. Unfortunately, per California state law, a car repair shop is unable to turn you away simply because your check engine light is on. As such, they will test your car and you will fail.

Why is California so strict on smog? ›

Because our air quality problems are more severe than the rest of the country, and also in recognition of the fact that California had already set up its own regulatory apparatus to deal with air pollution [known as CARB], we were given the right in 1970 to set our own emissions standards for vehicles as long as they ...

How old does a car have to be to not be smogged in California? ›

Your vehicle does not need a smog inspection if your: Gasoline-powered vehicle is a 1975 year model or older (This includes motorcycles and trailers.) Diesel-powered vehicle is a 1997 and older year model OR with a Gross Vehicle Weight of more than 14,000 pounds.

What cities in ca don t require smog? ›

Participating counties
CountySmog check required? (As of 2022)
San BernardinoNo
San DiegoNo
San FranciscoYes
San JoaquinYes
54 more rows

Can you pass smog with a bad catalytic converter? ›

it definitely will not pass. You must have the correct converter for your vehicle. And the smog techs know what is correct for your year and model. How do I reset my catalytic converter so it can pass a smog check?

Should I drive my car around before a Smog Check? ›

When you arrive to have a vehicle smog check, your car should be warmed up. If it's not, there's a chance you could fail your car smog check simply because your car isn't ready for it. To prevent this from happening, drive your car for between 10 and 15 miles before having a vehicle smog check done.

Why do I have to drive my car 100 miles to pass smog after check engine light is fixed? ›

By driving, the car computer can scan everything and see if the coding is back up to par. After you drive for a specified amount of time, the computer will be able to determine if there is an issue or not.

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