What Sacramento's smog certification requires

Sacramento requires a smog certification — officially called a Smog Check — for most vehicles registered in the county. The test measures your vehicle's exhaust emissions to confirm they meet California air quality standards. You need this certificate before you can register or renew your vehicle registration with the California Department of Motor Vehicles (DMV).

The test itself takes about 10 to 30 minutes and costs between $30 and $70, depending on which testing station you visit and whether your vehicle passes on the first try. You cannot get the certificate from the DMV itself — you must go to a Bureau of Automotive Repair (BAR) certified smog station, which is a private business licensed by the state.

Not every vehicle needs a smog check. Vehicles registered outside California, vehicles less than four model years old, and some electric or hybrid vehicles are exempt. If you are unsure whether your vehicle needs one, the DMV website has a tool where you can enter your vehicle information and get an when ready answer.

Key Takeaways

  • You must obtain a smog certification from a BAR-certified testing station before you can register or renew your vehicle with the DMV.
  • The test costs between $30 and $70 and takes 10 to 30 minutes; the testing station, not the DMV, performs it.
  • Vehicles less than four model years old, vehicles registered outside California, and certain electric or hybrid vehicles do not need a smog check.
  • If your vehicle fails, you have 30 days to repair it and retest at no additional charge at the same station.
  • You can find BAR-certified stations in Sacramento through the Bureau of Automotive Repair's online search tool or by calling your local smog station directly.

Finding a smog testing station in Sacramento

The Bureau of Automotive Repair maintains an online directory of all certified smog stations in Sacramento County. You can search by zip code or station name at the BAR website. Most stations are independent repair shops, gas stations, or dedicated smog-check businesses — you do not need to use the dealership where you bought your car.

When you call or visit a station, confirm that it is open and ask whether it can test your specific vehicle type. Some stations specialize in certain makes or have equipment for only gasoline or diesel engines. Many stations accept walk-ins, but calling ahead to ask about wait times can save you a trip.

Bring your vehicle registration and a valid photo ID. The technician will need to know your vehicle's make, model, and year, which are on your registration. If your vehicle has had recent repairs or you have warning lights on your dashboard, mention this to the technician before the test begins.

What happens during the smog test

The technician will connect your vehicle to an emissions analyzer, which measures the levels of nitrogen oxides, carbon monoxide, and other pollutants in your exhaust. For most vehicles, this is a tailpipe test — the probe goes into your exhaust pipe while the engine runs at idle and at higher speeds. The machine records the readings and compares them to California's limits for your vehicle's model year.

The test takes about 10 to 30 minutes total, including paperwork. You will receive a printed certificate when ready if your vehicle passes. The certificate is valid for 30 days, so you have that window to submit it to the DMV when you register or renew your vehicle.

If your vehicle fails, the station will give you a detailed report showing which emissions exceeded the limit. You then have 30 days to repair the vehicle and return to the same station for a retest at no additional charge. After the repair, the retest usually takes less time than the initial test.

What to do if your vehicle fails the smog test

A failed smog test means your vehicle's emissions are above California's standards for that model year. The test report will specify which pollutants were too high — usually carbon monoxide or nitrogen oxides — which gives you and a mechanic a starting point for diagnosis.

Common reasons for failure include a faulty oxygen sensor, a clogged air filter, worn spark plugs, or a malfunctioning catalytic converter. You do not have to repair the vehicle at the smog station; you can take it to any mechanic you trust. However, you must return to the same station where you failed for the retest, and you have 30 days to do so.

If repairs are expensive and your vehicle is old, you may want to research whether your vehicle is may be able to access for California's Consumer information Program, which offers rebates toward vehicle replacement or repair for low-income owners whose vehicles fail smog tests. may be able to access depends on your income and your vehicle's age and condition.

Timing and registration important date

You need your smog certificate before you can complete vehicle registration or renewal with the DMV. If your registration is about to expire, do not wait until the last day to get tested — a failed test means you need time for repairs and a retest, and the 30-day window to retest could push you past your registration important date.

The smog certificate itself is valid for 30 days from the date of the test. If you pass the test but do not submit the certificate to the DMV within that 30 days, you will need to get tested again. Plan to get your test done at least two weeks before your registration expires, so you have time to handle a failure if one occurs.

You can submit your smog certificate to the DMV online through the DMV website, by mail, or in person at a DMV office. Online submission is usually the fastest — you upload a photo or scan of the certificate, and the DMV processes it within a few business days.

Cost and payment at smog stations

Smog test fees in Sacramento range from $30 to $70 depending on the station and your vehicle type. Diesel vehicles and trucks sometimes cost more than standard passenger cars. Most stations accept cash, debit cards, and credit cards — ask when you call or arrive.

If your vehicle fails and you need a retest, the retest is free at the same station within 30 days. You pay only if you go to a different station or if the 30-day window closes and you need a new test. Some stations may charge a small fee to print a replacement certificate if you lose the original, but this is typically $5 to $10.

There is no fee to submit your smog certificate to the DMV, though you will pay the standard vehicle registration renewal fee when you complete your registration.

Frequently Asked Questions

Can I get a smog certificate if my vehicle has a check engine light on?

No. If your check engine light is on, your vehicle will automatically fail the smog test. You must have the problem diagnosed and repaired first, then clear the diagnostic code before you can be tested. A mechanic can do this, or some auto parts stores will read the code for free to help you understand what needs repair.

How long does a smog certificate stay valid?

The certificate is valid for 30 days from the test date. You must submit it to the DMV within that window. If you do not register or renew your vehicle within 30 days, you will need a new smog test.

What if I move out of Sacramento after I get my smog certificate?

If you move to another California county, your smog certificate is still valid for 30 days and can be used for registration in your new county. If you move out of California, you do not need a California smog certificate for your new state's registration, though your new state may have its own emissions testing requirements.

Can I get a smog certificate for a vehicle I just bought used?

Yes. You need a smog certificate to register any used vehicle in Sacramento, regardless of where it was previously registered. The test is based on your vehicle's model year and type, not on its history. If the vehicle is less than four model years old, it may be exempt.

What happens if I register my vehicle without a smog certificate?

The DMV will not complete your registration without a valid smog certificate (unless your vehicle is exempt). If you submit your registration without one, the DMV will reject it and ask you to provide the certificate before processing your renewal or new registration.