California's STAR Program Runs Smog Stations at Repair Shops, Not DMV Offices
California's STAR (Smog Test And Repair) program operates through privately owned repair shops, not state facilities. When you need a smog test, you are looking for a shop that has been certified by the Bureau of Automotive Repair to perform STAR inspections. These shops test your vehicle's emissions, and if it fails, they can perform repairs on-site — or you can take it elsewhere.
The key difference from a regular smog station is that STAR shops combine testing and repair under one roof, which can save you time and money if your vehicle fails. Not every smog station is a STAR station. A regular smog station tests only; a STAR station tests and repairs.
Finding a STAR station near you requires using the official Bureau of Automotive Repair locator tool or calling your local air quality management district. The state does not maintain a single master list you can browse online, so you will need to search by location.
Key Takeaways
- STAR stations are certified repair shops, not government offices, and you can find them through the Bureau of Automotive Repair's online locator or by phone.
- A STAR station performs both the smog test and repairs in one place, whereas a regular smog station only tests.
- You can take your vehicle to any certified smog station for testing, but only STAR stations can repair emissions problems and retest without sending you elsewhere.
- Your vehicle's registration renewal notice will tell you whether you need a smog test and which type of station to visit.
How to Search for a STAR Station Online
The Bureau of Automotive Repair maintains a searchable database of all certified STAR stations. Visit the BAR website and use their "Find a STAR Station" tool. You enter your ZIP code or city name, and the tool returns a list of certified shops in your area, including their addresses and phone numbers.
The search results show whether each shop is a STAR station or a regular smog station. Some shops are certified for both. You can also see which shops perform repairs, which is useful if your vehicle fails and you want to fix it at the same location where it was tested.
If you cannot access the online tool or prefer to speak with someone, call your local air quality management district. They maintain their own lists of certified stations and can tell you which ones near you are STAR-certified.
What to Bring When You Visit a STAR Station
Bring your vehicle registration and proof of insurance. The smog station will need to see your current registration to confirm your vehicle is due for testing. Some stations also ask for your driver's license.
If your vehicle has failed a previous smog test and you are returning for a retest after repairs, bring documentation of the work that was done. This is not always required, but it helps the technician understand what was repaired and speeds up the retest process.
Arrive with a full gas tank or close to it. Some smog tests require the vehicle to have fuel in the tank, and a low fuel level can affect test results.
The Difference Between STAR and Regular Smog Stations
A regular smog station performs the test only. If your vehicle fails, you must take it to a repair shop, have the work done, and return to a smog station (any certified station) for a retest. This means two trips and potentially two separate fees.
A STAR station performs the test and can repair emissions-related problems on-site. If your vehicle fails, the technicians can diagnose the issue, fix it, and retest your vehicle without you leaving. You pay one fee for the entire process, and you avoid the back-and-forth.
STAR stations are required to charge a set fee for testing and repairs, which is regulated by the state. Regular smog stations also have regulated fees for testing, but repair costs vary by shop. If you know your vehicle will need repairs, a STAR station often saves money because the testing and repair fees are bundled and capped.
What Happens When Your Vehicle Fails a Smog Test
If your vehicle fails, the station will print a test report showing which emissions standards it did not meet. At a STAR station, the technician will explain what needs to be repaired and provide an estimate. Common repairs include replacing the oxygen sensor, fixing a loose gas cap, or addressing issues with the catalytic converter.
You can authorize repairs on the spot, or you can take the report to another repair shop if you prefer. If you choose to go elsewhere, you will need to return to any certified smog station (STAR or regular) for a retest once the repairs are complete. The retest fee is separate from the initial test fee.
Keep your test report. You will need it to show the repair shop what failed, and you must present it when you return for a retest. The report is valid for 30 days, so plan your repairs within that window.
How to Prepare Your Vehicle Before Testing
Drive your vehicle for at least 20 minutes before arriving at the smog station. The test measures emissions from a warmed-up engine, and a cold engine can produce inaccurate results that may cause a failure.
Check your gas cap. A loose or missing gas cap is one of the most common reasons vehicles fail smog tests, and it is the cheapest fix. Make sure it is tight and not cracked.
If your check engine light is on, address it before testing. The light indicates a problem that will likely cause a test failure. Many auto parts stores will read the code for free, and you can take that information to a repair shop to fix the underlying issue.
Make sure your tires are properly inflated. Underinflated tires can affect how the vehicle runs during the test and may contribute to a failure.
Understanding Your Smog Test Results
A passing result means your vehicle meets California's emissions standards and your registration can be renewed. The station will provide you with a certificate or a report that you can present to the DMV or use to renew your registration online.
A failing result lists the specific emissions that exceeded the limit. The report will show which pollutants (usually nitrogen oxides, hydrocarbons, or carbon monoxide) were too high. This information tells a repair technician where to focus their diagnosis.
Some vehicles are exempt from smog testing. New vehicles (typically less than four years old) and electric vehicles do not require smog tests. Your registration renewal notice will indicate whether your vehicle needs testing.
Frequently Asked Questions
Can I go to any smog station or does it have to be a STAR station?
You can go to any certified smog station for testing. However, if your vehicle fails and needs repairs, a STAR station is more convenient because it can repair and retest on-site. A regular station will only test, so you will need to go elsewhere for repairs and then return for a retest.
How much does a smog test cost at a STAR station?
The state sets a maximum fee for smog testing, which varies slightly by region but is typically between $50 and $70. Repair costs are separate and depend on what needs to be fixed. Call ahead to ask about the testing fee and get a repair estimate if you suspect your vehicle will fail.
What if I cannot find a STAR station near me?
Use the Bureau of Automotive Repair's online locator tool or call your local air quality management district. If no STAR stations are nearby, you can visit a regular smog station for testing. If you fail, you will need to arrange repairs at a separate shop and return for a retest.
How long does a smog test take?
A test typically takes 15 to 30 minutes. If repairs are needed at a STAR station, the time depends on the work required. straightforward fixes like replacing a gas cap take minutes; more complex repairs may take several hours or require a return visit.
Do I need an appointment or can I just walk in?
Most STAR stations accept walk-ins, but calling ahead is a good idea, especially if you expect repairs. Some shops get busy and may have a wait, or they may need time to order parts if your vehicle requires a repair they do not have in stock.