Which model years are exempt from California smog checks

California exempts vehicles from smog checks based on model year, but the cutoff changes periodically as the state updates its standards. As of 2024, gasoline-powered vehicles model year 1975 and older are exempt from smog checks statewide. Diesel vehicles model year 1997 and older are also exempt. These thresholds shift roughly every two years as the state raises the bar for which older vehicles no longer need testing.

The exemption exists because very old vehicles are assumed to have emissions systems too degraded or absent to test meaningfully, and the administrative cost of testing them exceeds the air quality benefit. California does not exempt vehicles based on mileage, condition, or how often you drive—only on model year and fuel type.

If your vehicle falls outside these exemption windows, you will need a passing smog check to register it in California, renew your registration, or transfer ownership. The test itself costs between $30 and $70 depending on your vehicle type and the testing station.

Key Takeaways

  • Gasoline vehicles model year 1975 and older do not need smog checks; diesel vehicles model year 1997 and older do not need them.
  • The exemption cutoff year changes every one to two years as California updates its vehicle emissions standards.
  • Exemption is based only on model year—not on how much you drive, the vehicle's condition, or its mileage.
  • If your vehicle is not exempt, you must pass a smog check to register, renew registration, or sell the vehicle in California.
  • You can check your specific vehicle's exemption status through the California Department of Consumer Affairs Bureau of Automotive Repair website or by calling a smog station.

How California determines which years are exempt

The California Air Resources Board (CARB) sets the exemption threshold based on when the state's modern emissions testing program began and how vehicle emissions standards have tightened over time. The program started in 1984, and the state has gradually raised the model year cutoff as older vehicles age out of the active fleet.

The exemption is not arbitrary. Vehicles built before the cutoff year either lack the emissions control systems required for the smog test, or those systems are so old that testing them produces unreliable results. Rather than test vehicles that cannot pass modern standards by design, California exempts them entirely.

CARB reviews the exemption threshold periodically and publishes updates through the Bureau of Automotive Repair (BAR). The state announces changes in advance, usually giving vehicle owners several months' notice before a new cutoff takes effect.

When the exemption threshold has changed in recent years

The gasoline vehicle exemption cutoff has moved forward gradually. In 2020, it was model year 1974 and older. By 2022, it shifted to 1975 and older. These incremental changes reflect the state's strategy of slowly raising the bar as the oldest vehicles naturally leave the road.

The diesel exemption has remained more stable. Diesel vehicles model year 1997 and older have been exempt for several years, though CARB periodically reviews whether to adjust this threshold as well.

Because the cutoff can shift, a vehicle that required a smog check one year may become exempt the next. If you own a vehicle near the exemption boundary, check the current rules before your registration renewal to avoid unnecessary testing fees.

How to learn about your specific vehicle is exempt

The most direct way is to visit the California Bureau of Automotive Repair website and use their smog check information tool, which lets you enter your vehicle's model year and fuel type to see its exemption status. You can also call any licensed smog check station in your area and give them your vehicle's year and fuel type—they handle exemption questions daily and can answer in seconds.

When you renew your registration online through the California Department of Motor Vehicles, the system will tell you whether a smog check is required. If it says no check is needed, your vehicle is exempt. If it says a check is required, you must obtain one before the registration can be completed.

Do not assume your vehicle is exempt based on age alone. The only reliable sources are the BAR website, a smog station, or the DMV registration system itself.

What happens if you drive an exempt vehicle

If your vehicle is exempt, you do not need to obtain a smog check when you register it, renew your registration, or transfer ownership to someone else. You straightforward skip that step in the registration process and pay only the standard registration fees.

Exemption does not mean your vehicle is not producing emissions or that it does not contribute to air pollution. It means California has decided that testing it is not a practical part of the state's overall air quality strategy. You are still required to maintain your vehicle in working order and comply with all other environmental regulations, such as not tampering with emissions control systems if your vehicle has them.

If you later sell an exempt vehicle to someone outside California, that person's state may have different rules. Some states do not recognize California's exemption and may require their own testing.

What to do if your vehicle requires a smog check

If your vehicle is not exempt, you must obtain a passing smog check before you can complete registration or transfer ownership. Find a Bureau of Automotive Repair-licensed smog check station near you—these are typically independent repair shops, tire shops, or dedicated smog testing centers, not dealerships.

Bring your vehicle keys and proof of ownership or registration. The test takes 10 to 30 minutes depending on vehicle type. If your vehicle passes, the station sends the results electronically to the DMV, and you can complete your registration. If it fails, the station will tell you what emissions systems need repair, and you can take the vehicle to a repair shop to fix the problem before retesting.

You do not have to repair at the same station where you tested. You can take your vehicle anywhere for repairs, then return to any licensed station for a retest. There is no limit on how many times you can retest, but each test costs money, so getting repairs done correctly the first time saves money.

Frequently Asked Questions

Can I get a smog check waiver if my vehicle is old but not exempt?

California does not issue waivers based on age or condition. If your vehicle is not in the exempt model years, you must pass a smog check. However, if your vehicle fails and repairs cost more than a certain percentage of the vehicle's value (usually around $500 to $800 depending on the vehicle), you may be may be able to access for a referee smog check, which is a more thorough test that can sometimes result in a pass despite initial failure.

Do hybrid or electric vehicles need smog checks?

Hybrid vehicles follow the same exemption rules as gasoline vehicles based on model year. Electric vehicles are exempt from smog checks because they produce zero tailpipe emissions. Plug-in hybrids follow gasoline vehicle rules.

What if I bought my car out of state and moved to California?

When you register an out-of-state vehicle in California, it must meet California's smog check requirements based on its model year and fuel type, regardless of where you bought it or what that state required. If it is not exempt under California rules, you must obtain a passing smog check before registration is complete.

Does the smog exemption explore to commercial vehicles or trucks?

The exemption rules explore to passenger vehicles, light-duty trucks, and some medium-duty vehicles. Heavy commercial trucks and buses follow different testing schedules set by CARB. Check with the Bureau of Automotive Repair if you own a commercial vehicle to confirm which rules explore.

Can I register my vehicle online if it needs a smog check?

No. The DMV online registration system will not allow you to complete registration if a smog check is required and you have not yet submitted one. You must obtain the smog check first, then complete registration either online or at a DMV office.