California smog check stations are run by the Bureau of Automotive Repair, a division of the Department of Consumer Affairs — not the DMV itself.

When you renew your vehicle registration or buy a used car in California, you may need a smog inspection. The DMV does not perform these tests. Instead, you go to an independent smog station certified by the state. Finding one near you takes a few minutes, and you have multiple ways to search.

The official way to find a station is through the Bureau of Automotive Repair's online locator at smogcheck.ca.gov. You enter your ZIP code or city, and the tool shows you certified stations within a set radius, their hours, phone numbers, and whether they accept appointments. Some stations are full-service repair shops; others do smog testing only.

Key Takeaways

  • The Bureau of Automotive Repair's website at smogcheck.ca.gov is the official source for finding certified smog stations in your area.
  • You can search by ZIP code or city name and filter results by distance, hours, and whether the station accepts appointments.
  • Smog checks cost between $30 and $80 depending on your vehicle type and the station, and you pay the station directly — not the DMV.
  • You need a smog certificate to register a vehicle or renew registration in most California counties, but some counties are exempt based on vehicle age and emissions history.
  • If your vehicle fails the smog test, you have 30 days to repair it and retest at any certified station before your registration expires.

How to use the official smog station locator

Go to smogcheck.ca.gov and click "Find a Smog Check Station." Enter your ZIP code or the name of your city. The map will show all certified stations within 10 miles by default, though you can expand the search radius.

Each station listing shows its address, phone number, hours of operation, and whether it accepts walk-ins or appointments only. Some stations specialize in light-duty vehicles (cars and small trucks); others handle heavy-duty trucks. Check the listing to confirm your vehicle type is accepted before you call or visit.

Many stations now let you book online through their own websites. If you see a "Schedule an Appointment" button on the station's listing, click it to see available times. Otherwise, call the station directly to ask about wait times and whether you need an appointment.

What to bring to your smog check appointment

Bring your vehicle registration or proof of ownership, your driver's license, and the vehicle keys. The technician will need to start the engine and may need to plug a diagnostic scanner into your vehicle's onboard computer.

If your vehicle is 1975 or older, you do not need a smog check at all — California exempts classic vehicles. If your vehicle is 1976 or newer, bring your current registration even if it has expired. The smog station will test your vehicle regardless of registration status.

Smog check costs and what they cover

A smog check typically costs between $30 and $80, depending on whether your vehicle is a light-duty car, a truck, or a diesel vehicle. Heavy-duty trucks and vehicles with special equipment cost more. You pay the station directly; the DMV does not collect this fee.

The test itself takes 10 to 30 minutes. The technician will run your vehicle through an emissions test, check your onboard diagnostic system, and inspect your emissions equipment. If your vehicle passes, you receive a smog certificate (also called a smog report) that you can show to the DMV when you renew your registration.

If your vehicle fails, the station will give you a detailed report of what failed. You then have 30 days to repair the vehicle and retest. You can retest at the same station or any other certified station — there is no penalty for choosing a different one.

Which California counties require a smog check

Most California counties require a smog check when you register or renew registration. However, some counties are exempt, and some vehicles are exempt based on age. The DMV website lists which counties require smog checks and which do not.

Generally, if your vehicle is newer than two model years and has no outstanding recalls, you may not need a smog check. If you are registering a vehicle for the first time in California, you almost always need one. If you are renewing registration, check your registration renewal notice — it will tell you whether a smog check is required.

What happens if your vehicle fails the smog test

A failed smog test does not prevent you from driving. You have 30 days from the test date to repair your vehicle and retest. During those 30 days, you can continue to drive and use the failed smog report as proof that you are working on repairs.

Common reasons for failure include a faulty oxygen sensor, a loose or missing gas cap, a malfunctioning catalytic converter, or an engine light that is on. Many of these repairs cost $100 to $500. If repairs are expensive, some counties offer smog repair information programs — ask the smog station or your county air quality district whether you may have access to.

When you retest, bring your repair receipts. If the vehicle passes the second test, you get a new smog certificate and can proceed with registration. If it fails again, you have another 30 days to repair and retest.

Alternatives if you cannot find a nearby station

If the smog station locator shows no results in your area, call your county air quality district directly. They can tell you which stations serve your area and may be able to direct you to a mobile testing unit if one operates in your county.

Some counties offer remote or mobile smog testing, especially in rural areas. A few stations also offer "test-only" appointments where they do not perform repairs, which can be cheaper if you plan to take your vehicle to a separate mechanic.

Frequently Asked Questions

Can I get a smog check at a regular mechanic or the DMV?

No. Only stations certified by the Bureau of Automotive Repair can issue a valid smog certificate. The DMV does not perform smog tests. Your regular mechanic may be able to do repairs after a failed test, but the smog test itself must happen at a certified station.

How long is a smog certificate valid?

A smog certificate is valid for 30 days from the test date. You must submit it to the DMV or use it to renew your registration within that window. If 30 days pass, you will need a new smog test.

What if I move to a different county — do I need a new smog check?

Not necessarily. If your vehicle already has a valid smog certificate from any California county, you can use it to register in your new county. However, if your certificate expires before you register, you will need a new one from a station in your new county.

Can I retest at a different station than the one that failed me?

Yes. You can retest at any certified smog station in California. There is no rule requiring you to return to the same station. Some people choose a different station if they want a second opinion or if another station has better hours.

Do I need a smog check if my vehicle is electric?

No. Electric vehicles are exempt from smog checks because they produce no emissions. Hybrid vehicles that have a gas engine may still require a smog check depending on the model year — check your registration renewal notice or call your county air quality district to confirm.