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Smog Check in National City, CA: A Practical Guide for Drivers

By Pacific Auto Repair · Updated September 2026

If you drive in National City or anywhere in the South Bay, a Smog Check is part of owning a vehicle in California. The inspection confirms that your car's emissions control system is working the way it was designed to, and a passing result is often required before you can renew your registration, sell a vehicle, or register a car you brought in from another state. The rules can feel confusing, especially because newer cars are exempt from one type of inspection but not another.

This guide explains who needs a Smog Check, when it's required, how to prepare, and what to do if your vehicle doesn't pass. It is based on guidance published by the California Bureau of Automotive Repair (BAR). Requirements can change, so always check your DMV notice and BAR's website for the latest details.

Which Vehicles Need a Smog Check in California?

According to BAR, the following vehicles are generally subject to the Smog Check program:

  • Gasoline, hybrid and alternative-fuel vehicles, model year 1976 and newer
  • Diesel vehicles, model year 1998 and newer, with a gross vehicle weight rating of 14,000 pounds or less

RVs, motorhomes, collector cars and government vehicles that meet these criteria also need a Smog Check. Hybrids follow the same model-year rules as gasoline vehicles.

Vehicles That Don't Need a Smog Check

Some vehicles are fully exempt, while some newer vehicles are exempt only in certain situations:

  • Eight model years old and newer (gasoline, hybrid and alternative fuel) — exempt for registration renewal only. A smog abatement fee is paid with your DMV renewal instead.
  • Four model years old and newer (gasoline, hybrid and alternative fuel) — exempt for change of ownership only. A smog transfer fee is paid to DMV instead.
  • Gasoline, hybrid and alternative-fuel vehicles, model year 1975 and older
  • Diesel vehicles, model year 1997 and older, and diesel vehicles rated over 14,000 pounds
  • Electric vehicles
  • Motorcycles

A simple way to work out when a newer car will need its first renewal Smog Check is to add eight to its model year. A 2020 model-year vehicle, for example, will first need one for its 2028 registration renewal.

When Is a Smog Check Required?

Registration renewal

For vehicles that aren't exempt, a Smog Check is required every other year to renew your registration. Your DMV renewal notice tells you whether you need one. Look for the message “Smog Certification Required” or “Smog Certification Required at a STAR station.” A STAR station is a licensed station that meets higher performance standards set by BAR. If your notice mentions STAR, the inspection must be performed at a STAR station.

Selling or buying a vehicle

If you're selling a vehicle, a Smog Check is required before the sale, and you should give the buyer a copy of the vehicle inspection report. If you're buying from a private seller, the vehicle must have passed a Smog Check within the last 90 days. A vehicle bought from a dealership must have passed within the past two years. Transfers between immediate family members generally don't require a new Smog Check, but a vehicle that a relative buys for you usually does.

Registering a vehicle in California for the first time

Vehicles purchased in another state, or previously registered in another state, need a Smog Check before they can be registered in California. The inspection also confirms that any aftermarket parts installed on the vehicle meet California requirements.

How to Prepare for Your Smog Inspection

A little preparation can save you a second trip:

  • Bring your DMV renewal notice if you have one. It helps the station verify your vehicle information.
  • Take care of the check engine light first. A lit check engine light signals a problem with the emissions system, and a vehicle will not pass while the light is on. Having the cause diagnosed and repaired before the inspection is the fastest route to a pass.
  • Drive normally after battery work. If the battery was recently disconnected or replaced, BAR recommends driving for a week or two so the vehicle's readiness monitors can reset.
  • Return modified software to stock. Modified or non-approved engine software will cause a vehicle to fail. Restore the manufacturer's original settings or a version approved by the California Air Resources Board.
  • Keep up with basic maintenance. Worn ignition parts, vacuum leaks and overdue service can all affect how cleanly an engine runs.
  • Ask about a pretest. Some stations offer a pre-inspection to spot potential problems before the official test. The station must give you an estimate before performing it.

What Happens During the Inspection

Depending on the vehicle, a Smog Check may include a visual inspection of emissions control components, a functional check of those systems, an on-board diagnostic (OBD) system check for most 2000 and newer model-year vehicles, and a tailpipe emissions test for pre-2000 vehicles. BAR notes that the inspection usually takes about 30 minutes. Afterward, you receive a vehicle inspection report showing whether the vehicle passed or failed. The report also identifies any open safety recalls on your vehicle.

How Much Does a Smog Check Cost?

Smog Check prices vary from station to station, and inspection prices are not regulated by BAR, so it's reasonable to compare. Every station must charge the state's $8.25 Smog Check certificate fee, and the station must give you an estimate that you authorize before the inspection begins. When you request a smog inspection from Pacific Auto Repair, ask us for the current price for your vehicle.

If Your Vehicle Passes

The station issues a smog certificate, which is sent electronically to DMV and is valid for 90 days. For a registration renewal, you can then complete your renewal with DMV. For a sale, give a copy of the vehicle inspection report to the buyer. Keep a copy of the report for your own records as well.

What If Your Vehicle Fails?

A failed Smog Check is frustrating, but it also tells you exactly where to start:

  • Review the vehicle inspection report and ask the station to explain anything that isn't clear.
  • Complete the necessary repairs. Some emissions parts and repairs may be covered by your vehicle's warranty, so check your owner's manual or contact the manufacturer. If you have a service contract, see our guide to extended warranty repairs.
  • Get the vehicle inspected again. Go to a STAR station if your DMV notice requires one; otherwise any test-and-repair or test-only station can perform the retest.
  • Ask about state assistance. BAR's Consumer Assistance Program offers financial help with emissions repairs, or with retiring a vehicle, for applicants and vehicles that meet its eligibility requirements.
  • Contact a Smog Check Referee for help with unusual vehicles, disputed results or hard-to-find emissions parts.

Keep in mind that California licenses stations in different categories. Test-only stations perform inspections but not emissions repairs, repair-only stations fix emissions problems but don't inspect, and test-and-repair stations do both.

Smog Inspections at Pacific Auto Repair

Smog inspections have long been one of the core services we offer drivers in National City and the South Bay, alongside general repairs, vehicle inspections and brake and light work. When you request service, please tell us what your DMV notice says (for example, whether it requires a STAR station) so we can confirm the right next step for your vehicle before you visit. If a problem turns up, we'll explain the results in plain language and talk through your options.

Frequently Asked Questions

How often do I need a Smog Check?

Once your gasoline, hybrid or alternative-fuel vehicle is more than eight model years old, a Smog Check is required every other year for registration renewal. It may also be needed when the vehicle changes ownership or is registered in California for the first time.

Do electric vehicles need a Smog Check?

No. Electric vehicles are exempt from the Smog Check program.

How long is a smog certificate valid?

A passing smog certificate is valid for 90 days.

Can I check a vehicle's past Smog Check results?

Yes. BAR offers an online inspection history lookup, which is especially useful when you're buying a used vehicle.

Need a smog inspection in National City? Request service online or get directions to our shop.

Sources: California Bureau of Automotive Repair — Smog Check: When you need one and what's required. Requirements may change; always confirm with BAR and DMV.

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