What Roseville's Smog Check requires and who has to get one

Roseville is in Placer County, which falls under the Sacramento Metropolitan Air Quality Management District (SMAQMD). This means your vehicle must pass a smog check before you can register it with the California Department of Motor Vehicles (DMV), and you must renew that smog check every two years after that.

You need a smog check if you own a vehicle that is at least four model years old. A 2021 model year car would need its first smog check in 2025. Vehicles that are three years old or newer do not require one. Diesel vehicles over 14,500 pounds gross vehicle weight rating follow different rules and are tested at a STAR station (Smog Check Referee Test And Repair), not a regular smog check station.

The test itself measures your vehicle's tailpipe emissions—what comes out of your exhaust. The technician plugs a probe into your tailpipe and reads the levels of nitrogen oxides, carbon monoxide, and other pollutants. If your vehicle passes, you get a certificate. If it fails, you have 30 days to repair it and retest at no additional fee at the same station.

Key Takeaways

  • Roseville vehicles need a smog check every two years after the first registration, and the test must happen at a station certified by the California Bureau of Automotive Repair.
  • You cannot register or renew registration without a passing smog check certificate, and the DMV will not process your paperwork without it.
  • If your vehicle fails, you have 30 days to repair it and return to the same station for a retest at no charge.
  • The test costs between $50 and $80 depending on the station, and you pay only once per test—not per attempt if you fail and retest.

Finding a smog check station in Roseville

You can find certified smog check stations through the California Bureau of Automotive Repair's official station locator at bar.ca.gov. Enter your zip code (95661, 95662, or 95747 for Roseville) and the search returns all active stations near you. Each listing shows the station's address, phone number, and hours.

Not all repair shops or service stations perform smog checks. The station must be certified by the state and display a Bureau of Automotive Repair certificate in the window. If you call ahead, ask whether they perform smog checks and whether they can test your specific vehicle type (some stations do not test diesel vehicles or vehicles with recent engine modifications).

You do not have to use the station closest to you. You can drive to any certified station in California. However, if your vehicle fails, you must return to the same station for the free retest within 30 days. Choose a station with convenient hours and a location you can easily return to if needed.

What happens if your vehicle fails the smog check

A failure means your vehicle's emissions are above the legal limit for at least one pollutant. The station prints a smog check test report that lists which emissions failed and by how much. This report is your starting point for repairs.

You have 30 days from the test date to repair your vehicle and return to the same station for a retest. The retest is free—you pay the initial test fee only once. Common repairs that address smog check failures include replacing a faulty oxygen sensor, fixing a vacuum leak, replacing a spark plug, or repairing the catalytic converter. If the repair is expensive, you may be able to claim a Gross Polluter Abatement Program exemption if your vehicle is older and the repair cost exceeds a certain threshold, but this requires meeting specific income and vehicle age requirements.

If you do not retest within 30 days, the test report expires and you must pay for a new smog check. You cannot register your vehicle without a passing certificate, so delaying the repair also delays registration.

Timing and registration important date

Your smog check certificate is valid for 30 days from the test date. You must use that certificate to register or renew your vehicle's registration within that window. If the certificate expires before you register, you will need a new smog check.

In Roseville, you can register your vehicle at the DMV office on Sunrise Avenue or online through the DMV website if you have a passing smog check certificate. Bring the certificate, your vehicle registration renewal notice, proof of insurance, and your driver's license. If you are registering a vehicle for the first time in California, bring the title and bill of sale as well.

Plan to get your smog check at least two weeks before your registration expires. This gives you time to repair and retest if you fail, and ensures your certificate does not expire before you can complete registration.

Cost and what to expect during the test

A smog check in Roseville costs between $50 and $80 depending on the station. Some stations charge slightly more for diesel vehicles or vehicles with recent modifications. Call ahead if you want to know the exact price before you arrive.

The test itself takes 10 to 15 minutes. The technician will ask for your keys and vehicle identification number (VIN). They will start your engine, let it warm up, and then insert a probe into your tailpipe. The machine reads your emissions and prints a report. If you pass, you receive a certificate when ready. If you fail, the report shows what failed and you can discuss repair options with the technician or take the report to your own mechanic.

Bring your vehicle registration or proof of ownership. Some stations also ask for your driver's license. You do not need an appointment at most stations, but calling ahead during busy seasons (spring and fall, when many people renew registration) can save you a wait.

Special cases: modified vehicles and older cars

If your vehicle has engine modifications—a different engine, turbocharger, or fuel system change—it may not pass a standard smog check. Some modifications are legal under California law, but the station must verify this before testing. Bring documentation of any modifications and ask the station whether they can test your vehicle. If they cannot, they will refer you to a STAR station, which has more authority to evaluate modified vehicles.

Older vehicles (typically 1975 and earlier) may be exempt from smog checks entirely, depending on their registration status. Check with the DMV or the station before paying for a test if your vehicle is very old.

Vehicles registered as classic cars or collector vehicles in California have different smog check rules. If your vehicle is registered under these categories, ask the station whether a standard smog check applies or whether you need a different test.

Frequently Asked Questions

Can I get a smog check if my check engine light is on?

No. The station will not test your vehicle if the check engine light is illuminated. You must have the code read and the underlying problem repaired first. Once the light is off and the repair is confirmed, you can return for the smog check.

What if I fail the smog check twice?

You can retest as many times as you need within 30 days at no additional charge. If repairs are not fixing the problem, take your vehicle to a mechanic who specializes in emissions systems. They can diagnose the root cause more thoroughly than a smog check station can.

Do I need a smog check if I am just renewing my registration online?

Yes. Even if you renew registration online through the DMV website, you must have a passing smog check certificate on file. The DMV will not process your renewal without it, whether you renew in person or online.

Can I use a smog check certificate from another state?

No. California only accepts smog check certificates from California-certified stations. If you moved to Roseville from another state, you must get a California smog check before you can register your vehicle here.

What happens if my vehicle is registered out of state but I live in Roseville?

You must register your vehicle in California within 20 days of establishing residency. Once you do, you will need a California smog check certificate as part of that registration process.