What STAR certification means for your smog test
A STAR-certified smog test station is a repair shop or testing facility that has passed California's Smog Check Referee Program standards. STAR stands for "Smog Check Test and Repair." These stations meet stricter equipment and training requirements than regular smog check stations, and they're authorized to perform referee tests — the second opinion you can request if you fail your initial smog test.
The key difference is that STAR stations have more rigorous oversight. They're inspected more frequently, their equipment is calibrated to tighter tolerances, and their technicians must complete additional training. If you failed a smog test at a regular station and want to challenge that result, a STAR station is where you go.
Not every smog check station is STAR-certified. Regular stations can perform the standard smog test required for registration, but only STAR stations can issue a referee test result that overrides a previous failure.
Key Takeaways
- STAR-certified stations are authorized to perform referee smog tests, which are the formal challenge process if you fail your initial test.
- You can find STAR stations through the California Bureau of Automotive Repair's online search tool by entering your ZIP code.
- A referee test costs more than a standard smog test and requires you to bring your original test paperwork and vehicle registration.
- STAR stations must follow stricter equipment and training standards, making their results more defensible if you dispute a failure.
- If a STAR referee test also shows your vehicle fails, you will need repairs before you can pass any smog test.
How to search the official STAR station directory
The California Bureau of Automotive Repair (BAR) maintains the only official list of STAR-certified stations. You can search it on the BAR website at bar.ca.gov under the "Find a STAR Station" tool. Enter your ZIP code, and the search returns all certified stations within a set radius, along with their addresses, phone numbers, and hours.
The search tool also shows whether each station performs referee tests, repairs, or both. Some STAR stations only test; others test and repair. If you need a referee test, make sure the station's listing says it performs that service before you call.
This directory is updated regularly as stations gain or lose certification. Using the official search is faster and more reliable than searching "STAR smog test near me" online, because independent websites may list outdated information.
When you need a STAR referee test instead of a regular test
You don't automatically go to a STAR station for your first smog test. Most people use a regular smog check station for their initial test, which is faster and less expensive. You only need a STAR station if one of two things happens: you failed your first test and want to request a referee test, or your vehicle is in a referee test program because of repeated failures.
A referee test is a formal process. You bring your vehicle, your original failing test report, and your registration to the STAR station. The referee technician performs the test again, and their result becomes the official record. If the referee test shows a pass, it overrides the failure. If it shows a fail, you must have repairs done before you can pass any smog test.
The referee test costs more than a standard test — typically $50 to $100 depending on the station and your vehicle type — because it involves more documentation and a higher level of scrutiny.
What to bring to your STAR referee test appointment
Bring your original smog test report from the station where you failed. This document shows the test date, the specific measurements that failed, and the station's name and number. You'll also need your vehicle registration and a valid photo ID. Some stations may ask for proof of any repairs you've had done since the failure, even if those repairs didn't result in a new test.
Call ahead before you go. STAR stations often require an appointment for referee tests, and some have limited hours for this service. Asking whether they need anything else from you — such as maintenance records or a description of any warning lights — can save you a trip back home.
Do not bring your vehicle if it has an active check engine light that was not present during your original test. The referee technician will note this and may refuse to perform the test, because it suggests a new problem has developed.
How long a STAR referee test takes and what happens next
The actual test usually takes 30 to 45 minutes, but plan for an hour at the station because of paperwork and check-in. The technician will connect your vehicle to the smog test equipment, run the test sequence, and print the results on the spot.
If you pass the referee test, the station sends the results to the Department of Motor Vehicles electronically. Your registration can then be renewed. If you fail, the station gives you a copy of the results, and you'll need to have repairs performed before you can take another smog test anywhere.
Some STAR stations also perform repairs, so you can ask whether they can diagnose and fix the problem on-site. If they don't repair vehicles, they can usually recommend a shop. Keep in mind that you can take your vehicle to any repair shop you choose — you're not required to use the STAR station's repair services.
What to do if no STAR stations are near you
If the BAR search tool shows no STAR stations within a reasonable distance, you have options. First, check whether any stations listed are willing to travel to you or whether they offer mobile testing. Some STAR stations serve rural areas by appointment.
Second, contact your local Bureau of Automotive Repair field office directly. They can tell you whether a station outside the search radius serves your area, or whether you're in a region where referee tests are handled differently. The BAR website lists field office phone numbers by county.
Third, if you live in a very remote area, ask the BAR whether you can request a referee test through a different process, such as an out-of-state test or a waiver. These are rare, but the BAR can explain what's available in your specific situation.
Understanding STAR certification versus other smog test options
California has three types of smog test stations: regular stations, STAR stations, and test-only stations. Regular stations perform standard smog tests and can perform repairs. Test-only stations perform standard smog tests but cannot repair vehicles. STAR stations are the only ones authorized to perform referee tests.
If you pass your initial test at any station, you're done — you don't need to go to a STAR station. STAR certification matters only if you fail and want to challenge the result, or if you're in a referee program. For a routine smog test, a regular station is usually faster and cheaper.
Some people choose STAR stations for their initial test anyway, believing the stricter standards make the test more reliable. This is a personal choice. The BAR oversees all three types, so any station's test is legally valid for registration purposes.
Frequently Asked Questions
Can I use a STAR station for my regular smog test, or only for a referee test?
You can use a STAR station for a regular smog test if you want to. STAR stations perform both standard tests and referee tests. However, a standard test at a STAR station costs the same or more than at a regular station, so most people save money by going to a regular station for their first test.
What if I fail a STAR referee test?
If you fail a referee test, that result is final for smog check purposes. You must have repairs done to address the failed emissions systems, then you can take a new smog test at any station. You cannot request another referee test until you've had repairs and taken a new standard test that also fails.
How much does a STAR referee test cost?
Costs vary by station and vehicle type, but referee tests typically range from $50 to $100. Call the station directly for their exact price. This is more expensive than a standard smog test, which usually costs $30 to $50, because the referee test involves more documentation and oversight.
Do I have to go to a STAR station if I failed my smog test?
No. You can choose to have repairs done and take a new standard test at any station instead of requesting a referee test. A referee test is optional — it's only useful if you believe the original test was wrong. If you know your vehicle needs repairs, skipping the referee test and going straight to repairs can save time and money.
Can a STAR station refuse to perform a referee test on my vehicle?
Yes. A STAR station can refuse a referee test if your vehicle has a new check engine light, active warning lights, or other conditions that suggest a problem developed after your original test. They can also refuse if your paperwork is incomplete or if the original test report is too old. Call ahead to confirm your vehicle meets their requirements.