Star smog check fees vary by location and test type, but typically run $50 to $80 for a basic inspection

A Star smog check — the official emissions test required in California — costs between $50 and $80 at most testing stations, though some charge as little as $40 and others as much as $100. The exact price depends on where you go, what kind of vehicle you drive, and whether your car needs the standard test or the more involved two-speed idle test. Star stations are privately owned repair shops and testing facilities that the state has certified to perform these inspections, so each one sets its own price within state guidelines.

The fee covers the inspection itself — the technician plugs in equipment, runs your vehicle through the test cycle, and generates the official report. If your car fails, you pay the testing fee regardless. A retest after repairs costs the same amount, so a vehicle that fails once and then passes on the second try will cost you $100 to $160 total in testing fees alone.

Key Takeaways

  • Star smog check fees range from $40 to $100 depending on the testing station and your vehicle type, with $50 to $80 being most common.
  • You pay the full testing fee even if your car fails, and a retest after repairs costs the same amount again.
  • Diesel vehicles and vehicles over 14 years old may have different test procedures that some stations charge more for.
  • The testing fee is separate from any repairs your vehicle needs to pass — a failed smog check often leads to additional repair costs.
  • You can call Star stations ahead of time to ask their specific price, since fees are not regulated by the state.

Why prices differ between Star stations

California does not set a fixed price for smog checks. The state certifies which shops can perform the test and what equipment they must use, but each Star station owner decides what to charge. This means two stations five miles apart can have different prices, and you have no way to know without calling or visiting.

Some stations bundle the test with other services — an oil change, tire rotation, or general inspection — and may offer a lower testing price if you use those services too. Others charge a flat rate and nothing more. Independent repair shops that happen to be Star certified often charge less than dedicated smog-check-only facilities, because they make money on repairs as well.

Location matters too. Urban areas with more competition tend to have lower prices than rural regions where fewer stations operate. If you live in a small town with only one Star station, you have no leverage to negotiate.

Different vehicle types and test procedures

Most passenger cars built after 2000 go through the OBD test — the technician connects a scanner to your vehicle's onboard diagnostic port, checks for fault codes, and verifies that your emissions system is working. This is the fastest and cheapest test, usually $50 to $65.

Older vehicles and some diesel engines require a two-speed idle test, where the technician revs your engine to specific RPMs and measures tailpipe emissions directly. This takes longer and requires more equipment, so some stations charge $10 to $20 more — $60 to $80 or higher. Diesel vehicles, heavy-duty trucks, and motorcycles may have their own fee structures; call ahead if you drive anything outside a standard passenger car.

Vehicles registered as classic cars or with historical plates sometimes have different testing requirements altogether and may cost more or less depending on the station's experience with that category.

What happens if your car fails

The testing fee is non-refundable whether you pass or fail. If your vehicle does not meet emissions standards, you will need repairs — and those repairs are where the real cost comes in. A failed oxygen sensor might cost $200 to $400 to replace. A faulty catalytic converter can run $800 to $2,000 or more. You do not know what repairs you need until a technician diagnoses the problem.

After repairs, you must return for a retest, which costs the full testing fee again. Some stations offer a discount on the retest if you had repairs done at their shop, but not all do. Budget for at least two testing fees if your vehicle fails the first time.

If repairs are expensive and your vehicle is old, you may decide the cost is not worth it. California has a Gross Polluter Abatement Program in some counties that can help with repair costs for low-income vehicle owners, but availability and income limits vary by location. Contact your local air quality management district to learn whether your county participates.

How to find Star stations and compare prices

The California Bureau of Automotive Repair maintains an online directory of certified Star stations. You can search by zip code or city to see which stations are near you, and the directory includes their phone numbers. Call three or four stations and ask their exact price — do not assume they are all the same.

Ask whether the price changes based on your vehicle type. Ask whether they offer any discount if you need a retest. Ask how long the test takes and whether you can wait or need to drop off your car. Some stations have a waiting list; others can fit you in within an hour.

Read online reviews on Google Maps or Yelp, but focus on whether people mention the price being fair and the test being completed accurately — not on whether the reviewer passed or failed, since that is not the station's fault. A station with consistent complaints about inflated prices or long waits is worth skipping even if it is slightly closer to your home.

Timing your smog check to avoid rush periods

Smog checks are required every two years for most vehicles, and many people wait until the last month before their current certificate expires. This creates a rush in the final weeks, and some stations may have longer waits or even temporarily raise prices during peak periods. If your certificate expires in December, scheduling your test in October or early November usually means shorter wait times and sometimes lower prices.

Weekday mornings are typically less busy than evenings and weekends. If you have flexibility in your schedule, a Tuesday or Wednesday morning visit often means you can get in and out faster than a Saturday afternoon appointment.

Frequently Asked Questions

Can I get a smog check at any repair shop, or does it have to be a Star station?

It must be a Star station — a shop certified by the California Bureau of Automotive Repair. Regular repair shops cannot issue an official smog certificate even if they have the equipment. The state maintains a searchable directory of certified stations on its website.

Do I have to pay for the test if I know my car will fail?

Yes. The testing fee is due whether you pass or fail. If you know your vehicle has emissions problems, you can have a mechanic diagnose and repair the issue first, then pay for the smog test once you are confident it will pass.

What if a Star station charges way more than others nearby?

You can report unusually high prices to the California Bureau of Automotive Repair, but the state does not regulate smog check fees. Your best option is to use a different station. If only one station serves your area, call ahead and ask whether they will match a lower price you found elsewhere.

Does the smog check fee include repairs if my car fails?

No. The testing fee covers only the inspection and report. Any repairs needed to pass are separate charges. Some stations offer repair services and may bundle a discount, but you are not required to use them — you can take your vehicle to any mechanic you trust.

How long does a smog check take?

An OBD test usually takes 10 to 20 minutes. A two-speed idle test takes 20 to 30 minutes. Wait times at the station depend on how busy they are; call ahead to ask whether you should expect a wait or can drop off your car and come back.