STAR smog check costs range from $30 to $80 depending on your vehicle type and test location

A STAR smog check — the official California emissions test — costs between $30 and $80 at most testing stations. The exact price depends on whether your vehicle is gasoline or diesel, its model year, and which testing station you visit. Stations set their own fees within state guidelines, so calling ahead or checking online can save you money.

The state does not set a fixed price, but it does cap what stations can charge. For most gasoline vehicles, you will pay closer to $30 to $50. Diesel vehicles and vehicles older than 1975 typically cost more — sometimes $60 to $80 — because they require different or more complex testing equipment.

The smog check fee is separate from any repairs your vehicle might need. If your car fails the test, you pay for the retest (usually the same fee) and any work required to pass. Some stations offer package deals that bundle the initial test and one retest, which can reduce your total cost if your vehicle does not pass on the first try.

Key Takeaways

  • Most gasoline vehicles cost $30 to $50 for a STAR smog check, while diesel and older vehicles run $60 to $80.
  • Testing stations set their own prices within state limits, so comparing nearby stations can lower your cost.
  • A retest after a failed inspection costs the same as the initial test and is not included in the first fee.
  • The smog check fee covers only the emissions test, not any repairs needed to pass.
  • Some stations offer package pricing for initial test plus one retest, which may cost less than paying separately.

How STAR testing stations set their prices

California allows STAR testing stations to charge within a range set by the state, but each station decides its own fee. This means two stations in the same city can charge different amounts for the same test. Stations are required to post their prices clearly, either on their website or at the location.

Independent smog shops, dealerships, and service stations all run STAR tests. Independent shops often charge less than dealerships because they have lower overhead. If you are having other work done on your vehicle, a dealership may bundle the smog check into a service package, which can change the total cost.

Some stations offer discounts for online booking or for customers who bring their own paperwork. A few stations in high-traffic areas charge at the top of the allowed range, while rural or less-busy locations may price lower to attract customers. Calling three or four nearby stations takes about ten minutes and can save you $10 to $20.

What the test covers and why it costs what it does

A STAR smog check measures your vehicle's emissions through a tailpipe test or onboard diagnostic scan, depending on the vehicle year and type. The equipment required to run these tests is expensive — a full STAR testing station can cost $10,000 to $30,000 to set up and maintain. The fee you pay covers the technician's time, equipment wear, software licensing, and the station's overhead.

Diesel vehicles and vehicles made before 1975 cost more because they require specialized equipment or longer testing procedures. A diesel test may take 20 to 30 minutes, while a gasoline vehicle test typically takes 10 to 15 minutes. The extra time and equipment justify the higher fee.

The state also requires STAR stations to maintain strict quality standards and undergo regular audits. These compliance costs are factored into the fees stations charge. You are not paying for the state audit directly, but the station's need to stay certified is part of why the test is not free.

Retests and what happens if your vehicle fails

If your vehicle fails the smog check, you must pay for a retest. The retest fee is usually the same as the initial test — $30 to $80 depending on your vehicle type. You do not have to retest at the same station, but most people do because they already know the price and location.

Before you retest, you will need to have repairs done. The cost of repairs varies widely depending on what is wrong with your vehicle. Common repairs include replacing an oxygen sensor ($150 to $300), fixing a catalytic converter ($400 to $1,200), or addressing an engine control system issue ($100 to $500). Some repairs are straightforward and inexpensive; others are not.

A few stations offer a "test and retest" package that bundles the initial test and one retest into a single price, usually $50 to $100 total. This can save money if you expect your vehicle might not pass on the first try. Ask about package pricing when you call for a quote.

Where to find STAR testing stations and compare prices

The California Bureau of Automotive Repair maintains a searchable database of all licensed STAR stations on its website. You can search by zip code or city to find stations near you, and the database shows each station's address, phone number, and hours. Some listings include pricing information, though not all stations update it regularly.

Calling ahead is the fastest way to get current pricing. Most stations will quote you over the phone in under a minute if you tell them your vehicle's year, make, and whether it is gasoline or diesel. Many stations also have websites or social media pages where they post their current fees.

Google Maps and Yelp often show smog check stations with customer reviews and posted prices. Reviews can tell you whether a station is quick, honest, and worth the cost. If a station has many complaints about high prices or failed retests, it is worth trying another location.

Timing and when you need a smog check

In California, you need a smog check every two years if your vehicle is registered in the state. Your registration renewal notice will tell you whether a smog check is required. If it is, you must complete the test before your registration expires, or you cannot legally drive the vehicle.

Plan to get your smog check at least two weeks before your registration expires. This gives you time to have repairs done if your vehicle fails, and to retest if needed. If you wait until the last few days, you risk running out of time and driving with expired registration.

Some stations are busier than others depending on the time of year. The weeks before registration important date are typically the busiest, so you may wait longer or have fewer appointment slots available. Getting your test done early in the renewal window can save time and frustration.

Frequently Asked Questions

Can I get a smog check at any gas station or repair shop?

No. Only stations licensed by the California Bureau of Automotive Repair can perform STAR smog checks. You can find licensed stations through the state's online database. Gas stations and independent repair shops may be licensed, but not all are.

Do I have to pay for a smog check if my vehicle is brand new?

New vehicles are exempt from smog checks for the first four years of registration. After that, you will need a smog check every two years. Your registration renewal notice will tell you when the exemption ends.

What if I fail the smog check twice?

After two failed tests, you may be able to get a referee smog check at a state-run facility, which costs less than a regular STAR test. A referee check is offered only after two failures and is meant to resolve disputes about whether a vehicle truly cannot pass. Ask your testing station about referee options if you fail twice.

Is there a way to avoid paying for a smog check?

No. If your vehicle is registered in California and is not exempt, you must pay for a smog check to renew your registration. Some vehicles are exempt — electric vehicles, vehicles under four years old, and vehicles registered as classic cars in certain cases — but most cars and trucks require the test.

Can I get a refund if the test is wrong?

If you believe a test result is incorrect, you can request a retest at a different station or ask for a referee smog check. You will have to pay the retest fee, but if the second test shows a different result, you may have grounds to dispute the first station's fee. Contact the Bureau of Automotive Repair if you believe a station charged you unfairly or gave you an inaccurate result.