Smog check costs vary by test type and location, but expect $30 to $80 for a basic inspection

A smog check in California costs between $30 and $80 depending on whether you need a standard inspection or a more involved test. The exact price depends on your vehicle type, which test station you visit, and whether your car passes or fails on the first try. Stations are independently owned, so they set their own fees within state limits.

You will not pay the state directly — you pay the smog check station, which then reports the results to the state's testing database. If your vehicle fails, you will need repairs and a retest, which means additional costs beyond the initial inspection fee.

Key Takeaways

  • A standard smog check costs $30 to $80 at most California stations, with no state-set maximum price.
  • Diesel vehicles and vehicles over 14 years old may cost more because they require different testing equipment.
  • If your car fails, you pay for repairs plus a retest fee, which is usually the same as the original inspection cost.
  • Some stations offer discounts or package deals if you combine the inspection with repairs on-site.
  • You can call stations ahead of time to ask their specific price before you visit.

What the two main test types cost

California uses two smog check methods: the OBD test (On-Board Diagnostic) and the two-speed test. Most vehicles built after 1996 use the OBD test, which reads your vehicle's computer and costs $30 to $50. The station plugs in a device, checks for fault codes, and you get results in minutes.

Vehicles older than 1996 or those that fail the OBD test must use the two-speed test, which is a more involved process. The technician puts your car on a dynamometer (a machine that measures emissions while the engine runs at different speeds) and costs $50 to $80. This test takes longer and requires more specialized equipment, which is why it costs more.

Diesel vehicles and older cars cost more

If you drive a diesel vehicle, expect to pay $50 to $100 because diesel testing requires different equipment and informed. Not all stations test diesel vehicles, so you may need to call ahead to find one that does.

Vehicles 14 years old or older also typically cost more — usually $60 to $80 — because they cannot use the OBD test and must go through the two-speed test. The age cutoff changes each year (it moves forward by one model year annually), so a 2010 vehicle in 2024 may fall into this category.

What happens if your car fails

A failed smog check means your vehicle did not meet California's emissions standards. You will need to have repairs made and then return for a retest. The retest costs the same as the original inspection — $30 to $80 depending on your vehicle type and the station.

Some stations offer repair services on-site and may bundle the inspection, repairs, and retest into a package price. This can sometimes cost less than paying each fee separately, but you should ask for the total cost upfront before agreeing. Other stations only perform inspections and will refer you elsewhere for repairs.

How to find the lowest price in your area

Smog check stations are independently operated, so prices vary block by block. Call three or four stations near you and ask their inspection fee for your vehicle type. Many stations post prices online or on their storefront, but calling ensures you get the current rate.

Ask whether the price includes the certificate (the official document you need to register your vehicle) and whether they offer any discounts. Some stations reduce the retest fee if you fail and return within a certain timeframe. A few offer discounts if you combine the inspection with repairs, though this only helps if you plan to have them do the work.

When you need a smog check

California requires a smog check every two years for most vehicles, though the timing depends on your vehicle's age and registration date. You typically need one before you renew your registration, and your registration renewal notice will tell you whether a smog check is required.

New vehicles (usually those under 8 years old) are exempt from smog checks in their first registration period. Vehicles 16 years old or older are also exempt in most cases, though you should check your renewal notice to be sure. If you are buying a used vehicle in California, the seller must provide a smog check certificate dated within 90 days of the sale.

What to bring to the station

Bring your vehicle registration or renewal notice so the technician can confirm which test your vehicle needs. You will also need a valid form of identification and payment (cash, card, or check depending on the station). Some stations ask for your vehicle identification number (VIN) ahead of time so they can look up your vehicle's history.

Make sure your vehicle is in good working condition before you arrive — do not arrive with a check engine light on or obvious mechanical problems, as the station may refuse to test you or the test may fail when ready. If your check engine light is on, have it diagnosed first, as this usually means your vehicle will not pass.

Frequently Asked Questions

Can I get a smog check at any repair shop?

No. Only stations licensed by the California Bureau of Automotive Repair can perform official smog checks. You can search for licensed stations on the Bureau's website by entering your zip code. Some repair shops have smog check licenses, but not all do.

Do I have to get the smog check at the same place where I get repairs?

No. You can get your inspection at one station and take your vehicle elsewhere for repairs if you fail. However, some stations offer lower combined prices if you use them for both, so it is worth comparing the total cost before you decide.

What if I fail the smog check — do I have to pay again when ready?

You do not have to retest when ready, but you cannot register your vehicle until you pass. Most people get repairs done within a few days and retest right away. You will pay the retest fee at that time, which is usually the same as the original inspection cost.

Are there any smog check discounts for low-income drivers?

California does not offer a state-funded discount program for smog checks themselves. However, some individual stations may offer discounts — it is worth calling ahead to ask. If you need help with vehicle repairs to pass the smog check, some nonprofits and local programs offer repair information, but these are separate from the inspection fee.

How long does a smog check take?

An OBD test usually takes 10 to 15 minutes. A two-speed test takes 20 to 30 minutes. Wait times depend on how busy the station is, so arriving early in the day or on a weekday may be faster than visiting on a weekend.