California smog test costs range from $30 to $80 depending on your vehicle type and test location
A standard smog test in California costs between $30 and $80. The exact price depends on whether your vehicle needs a basic test or a more complex one, and which testing station you visit. Smog-only stations (also called STAR stations) tend to charge less than full-service repair shops that also offer smog testing. Your vehicle's model year and engine type determine which test protocol applies, not your choice.
You pay the testing station directly at the time of the test. There is no state fee separate from what the station charges. If your vehicle fails, you pay the test fee again when you retest — the first fee does not roll into a second test or give you a credit.
Key Takeaways
- Smog test costs vary by station and vehicle type, typically $30 to $80, and you pay at the time of testing.
- STAR stations (smog-only facilities) usually charge less than repair shops, and you can search for them by ZIP code on the California Bureau of Automotive Repair website.
- Vehicles from 1975 and earlier, electric vehicles, and some newer hybrids may be exempt from smog testing requirements.
- A failed test means paying the test fee again for a retest, so budget for that possibility if your vehicle has been running rough.
- The test itself takes 10 to 30 minutes, and you receive your results and certificate the same day if you pass.
What determines your smog test cost
The California Bureau of Automotive Repair does not set a fixed price for smog tests. Instead, each testing station sets its own fee within a range. A basic smog test for a 2000 model-year vehicle costs less than a test for a 1996 model-year vehicle, because older vehicles require a more involved test protocol called a two-speed idle test or loaded mode dynamometer test. Newer vehicles (typically 1996 and later) use an OBD test, which reads your vehicle's onboard computer and is faster and cheaper to perform.
Diesel vehicles cost more to test than gasoline vehicles because the test procedure is different and takes longer. If you drive a diesel truck or van, expect to pay toward the higher end of the range or slightly above it. Hybrid vehicles may may have access to for exemptions depending on model year and powertrain type, so confirm your vehicle's status before paying for a test you may not need.
Where to find testing stations and compare prices
The California Bureau of Automotive Repair maintains a searchable database of all licensed smog testing stations. You can search by ZIP code, city, or station name at the Bureau's website. The database shows each station's address, phone number, and hours. It does not display prices, so you will need to call ahead or visit in person to ask what the station charges for your vehicle type.
STAR stations are smog-only facilities certified by the state. They do not perform repairs, which keeps overhead lower and often results in lower test fees. A STAR station near you may charge $35 to $50, while a repair shop offering smog testing might charge $60 to $80 for the same vehicle. Calling three or four stations in your area takes 10 minutes and can save you $20 to $30.
What happens if your vehicle fails the smog test
If your vehicle fails, you receive a detailed report showing which emissions standards it did not meet. You then have the option to repair the vehicle and retest, or in some cases pursue a Gross Polluter Abatement Program waiver if your vehicle is very old and repairs would cost more than the vehicle's value. The retest fee is the same as the original test fee — there is no discount for retesting.
You do not have to retest at the same station. If you repair your vehicle at a shop, you can take it to any licensed smog station for the retest. Some repair shops offer a discount on the retest fee if you had them perform the repairs, but this is not required and varies by shop. Budget for the full test fee again when planning repairs.
Vehicles that may not need a smog test
California exempts certain vehicles from smog testing requirements. Vehicles manufactured in 1975 or earlier do not require smog tests. Electric vehicles and some plug-in hybrids are also exempt, depending on model year and certification status. Vehicles registered as classic cars or collector vehicles under California law may be exempt if they are driven fewer than 6,000 miles per year.
The only way to confirm your vehicle's exemption status is to check the California Department of Motor Vehicles website or contact your local DMV office before scheduling a test. Do not assume your vehicle is exempt based on age or type — the rules are specific, and paying for an unnecessary test is cheaper than paying a fine for not testing when required.
How to prepare for your smog test and what to bring
Bring your vehicle registration and a valid photo ID to the testing station. The registration proves you own the vehicle and shows the current registration status. Some stations may ask for your Vehicle Identification Number (VIN), which is on your registration and on the dashboard of your vehicle.
Before the test, make sure your vehicle has been driven for at least 20 minutes so the engine is warm. A cold engine can produce false readings. If your check engine light is on, the vehicle will fail the test automatically in most cases, so have that diagnosed before paying for a test. Top off your fuel tank or make sure you have at least a quarter tank — some testing stations require this.
Timeline and what to expect on test day
The actual smog test takes 10 to 30 minutes depending on your vehicle's age and test type. You will receive your results and a certificate the same day if you pass. If you fail, you get a detailed report and can leave when ready to arrange repairs. The certificate is valid for 30 days, so you have that window to register your vehicle with the DMV.
Plan to spend 45 minutes to an hour at the testing station when you account for check-in, the test itself, and paperwork. Many stations do not require appointments, but calling ahead to confirm hours and ask about wait times is worth doing, especially during peak times like the end of the month or before registration important date.
Frequently Asked Questions
Can I get a smog test at any repair shop, or does it have to be a STAR station?
Any licensed smog testing station can perform your test, whether it is a STAR station or a repair shop. STAR stations are cheaper on average because they only test and do not repair. Repair shops can test, but they charge more. Both are equally valid for registration purposes.
What if I fail the smog test and cannot afford repairs?
If your vehicle is very old and repairs cost more than the vehicle is worth, you may be able to pursue a Gross Polluter Abatement Program waiver through the California Air Resources Board. This is not automatic — you must meet specific income and vehicle value thresholds. Contact your local air quality management district to learn whether you may have access to.
Do I need a smog test every year, or only when I renew my registration?
California requires a smog test every two years for most vehicles, timed with your registration renewal. Some vehicles require annual testing. Check your registration notice or the California DMV website to see whether your vehicle needs a test this year.
Can I get a smog test before my registration expires, or do I have to wait until the renewal notice arrives?
You can test up to 90 days before your registration expires. Testing early gives you time to repair and retest if needed. The certificate is valid for 30 days, so if you test too far in advance, it may expire before you can register.
What if the testing station says my vehicle cannot be tested because of a mechanical problem?
Some vehicles cannot be tested if the fuel door is broken, the gas cap is missing, or the vehicle will not start. Fix these issues first, then return for testing. If the vehicle has a serious mechanical problem that prevents testing, you may need a referee inspection through the California Bureau of Automotive Repair before you can proceed.