STAR stations are California's official smog check testing network

STAR stands for Smog Check Test and Repair, and these are the only stations in California legally permitted to perform smog checks for vehicle registration. STAR stations are certified by the California Bureau of Automotive Repair and operate under strict state rules. When you need a smog check, you must go to a STAR station — independent shops, dealerships, and chain repair facilities can all be STAR-certified, but the certification itself is what matters, not the type of business.

Every STAR station uses the same state-mandated testing equipment and follows identical testing procedures. This means your test results are valid anywhere in California and will be accepted by the Department of Motor Vehicles. The station does not decide whether you pass or fail — the equipment does, and the results are reported directly to the state's database.

Key Takeaways

  • STAR stations are the only places where smog check tests are legally valid in California, and you can find them by searching the Bureau of Automotive Repair's online directory.
  • All STAR stations use identical state-mandated equipment and testing procedures, so results are uniform regardless of which station you visit.
  • A STAR station can perform both testing and repairs, but you are not required to use the same station for both services.
  • Test results are reported to the state automatically, and your vehicle registration will not process until the DMV receives a passing result.

How to find a STAR station near you

The California Bureau of Automotive Repair maintains an online directory of all certified STAR stations. You can search by zip code, city, or county to see which stations operate in your area, their hours, and their contact information. The directory is updated regularly and shows whether each station performs testing only or both testing and repairs.

You can also call your local smog check station directly to confirm they are STAR-certified before you visit. Many stations advertise their STAR certification prominently, but calling ahead saves a wasted trip if the station has closed or changed its services. Some stations require appointments, while others accept walk-ins — this varies by location.

What happens during a STAR smog check test

When you arrive at a STAR station, bring your vehicle registration, proof of insurance, and a valid ID. The technician will connect your vehicle to the state-mandated testing equipment, which measures your vehicle's emissions. The test takes about 10 to 15 minutes and produces a pass or fail result on the spot.

The equipment tests different emissions depending on your vehicle's model year and type. Older vehicles undergo a more thorough test than newer ones. Once testing is complete, the results are transmitted directly to the state's database — you do not need to do anything else to report the results. You will receive a paper receipt showing whether you passed or failed.

STAR stations that perform repairs

Some STAR stations only perform testing, while others are also certified to perform smog check repairs. If your vehicle fails the test, you have the option to repair it at the same station or take it elsewhere. You are not required to use the same station for repairs, and you can shop around for repair costs.

If you choose to repair at a different station, that station does not need to be STAR-certified — only the testing station must be. However, after repairs are complete, you must return to a STAR station for a retest. The retest is a separate transaction and costs the same as the initial test.

Cost and timing for STAR smog checks

The state sets a maximum fee for smog checks, but individual STAR stations can charge less than the maximum. As of 2024, the maximum fee for a basic smog check is set by the Bureau of Automotive Repair and varies slightly depending on vehicle type. Call ahead to confirm the exact price at your chosen station, as some stations offer discounts or promotions.

A passing test result is valid for 30 days before you must submit it to the DMV for registration renewal. If you fail and need repairs, you have no time limit to complete them — but your registration will not renew until you pass a retest and submit that result. Plan to visit a STAR station at least 30 days before your registration expires to leave time for repairs if needed.

What makes a station STAR-certified

STAR certification requires that a station meet specific equipment standards, employ trained and licensed technicians, and follow all state testing procedures without exception. The Bureau of Automotive Repair inspects STAR stations regularly to may support compliance. Stations that fail inspections or violate testing rules can lose their STAR certification.

Because all STAR stations follow identical procedures and use identical equipment, a test result from one station is legally equivalent to a result from any other. This uniformity is the entire point of the STAR system — it prevents stations from manipulating results or using outdated equipment.

Frequently Asked Questions

Can I get a smog check at a non-STAR station?

No. Only STAR-certified stations can perform smog checks that are valid for vehicle registration in California. Results from any other source will not be accepted by the DMV. If you are unsure whether a station is STAR-certified, check the Bureau of Automotive Repair's directory or call the station directly.

What if I fail my smog check?

You will receive a detailed report showing which emissions failed. You can take this report to any repair shop — it does not have to be the same STAR station where you tested. After repairs, you must return to a STAR station for a retest. The retest costs the same as the initial test.

How long does a smog check take?

The actual test takes 10 to 15 minutes. However, wait times at the station vary depending on how busy it is. Some stations require appointments to avoid long waits, while others operate on a first-come, first-served basis. Call ahead to ask about wait times or to schedule an appointment.

Do I need an appointment at a STAR station?

It depends on the station. Some STAR stations accept walk-ins, while others require appointments. Check the Bureau of Automotive Repair's directory or call the station directly to find out their policy. Making an appointment usually means a shorter wait.

Is my smog check result valid if I move to another state?

No. Smog check results are only valid in California for vehicle registration purposes. If you move out of state, you will need to follow that state's emissions testing rules, which may be different or may not exist at all.