STAR stations are California's official smog test centers, and test-only locations do not repair your vehicle
A STAR station test-only is a smog check location run by the California Bureau of Automotive Repair that performs emissions tests but does not do repairs. You drive in, they test your vehicle's emissions against state standards, and you leave with a pass or fail result. If you fail, you take your vehicle elsewhere to be repaired, then return to any STAR station to retest.
Test-only stations exist because California law separates testing from repair work. This separation prevents a conflict of interest — a repair shop has financial incentive to find problems and charge you to fix them, so the state created independent test-only locations to give you an unbiased result. You can find STAR test-only stations through the Bureau of Automotive Repair's online locator on the BAR website.
The test itself is the same whether you go to a test-only station or a combined test-and-repair facility. The technician plugs a diagnostic machine into your vehicle's onboard computer, reads your emissions data, and compares it to the standards for your vehicle's year and model. The result is either a pass, a fail, or a conditional pass (which means you passed but your vehicle has a warning light that needs attention before your next test).
Key Takeaways
- STAR test-only stations perform smog checks but do not repair vehicles, so you cannot get repairs done at the same location.
- Test-only stations charge the same smog check fee as combined facilities, typically between $30 and $50 depending on your vehicle type.
- If you fail at a test-only station, you must take your vehicle to a repair shop, have work done, and return to any STAR station to retest.
- You can locate STAR test-only stations near you through the Bureau of Automotive Repair's online search tool on the official BAR website.
How the test-only process works from start to finish
When you arrive at a STAR test-only station, bring your vehicle registration and a valid photo ID. The technician will verify your vehicle's information, confirm that your vehicle is due for a smog check (or that you are retesting after a repair), and then perform the test. The entire process usually takes 15 to 30 minutes.
During the test, the technician connects a machine to your vehicle's diagnostic port, which is typically located under the steering wheel or dashboard. The machine reads data from your vehicle's emissions control system and compares it to California's standards for your vehicle's model year. You will receive a printed result on the spot.
If you pass, the technician uploads your passing result to the California Department of Motor Vehicles electronically. You do not need to do anything else — your registration will update automatically. If you fail, you receive a detailed report showing which emissions standards your vehicle did not meet. Take this report to a repair shop so the technician knows what to fix.
When to choose a test-only station versus a combined facility
Choose a test-only station if you want an independent test result before deciding where to get repairs, or if you already have a trusted repair shop and do not want to use the station's repair services. Test-only stations are also useful if you are retesting after repairs — you can go to any STAR station without returning to the same place.
Choose a combined test-and-repair facility if you want to test and repair in one visit and you trust that particular shop. Combined facilities can be more convenient because you do not have to drive twice, and the repair technician can discuss the test results with you in person. However, you have no obligation to use a combined facility's repair services — you can test anywhere and repair anywhere.
Some people use test-only stations strategically: they test first to see what needs fixing, get a second opinion from their regular mechanic, and then decide where to have the work done. This approach takes more time but can save money if the repair estimate is high.
What happens if you fail your smog check
A fail result means your vehicle's emissions exceeded California's limits for at least one pollutant. The test report will specify which standards were not met — for example, nitrogen oxides (NOx) or particulate matter. This information tells a repair technician what systems to inspect and potentially repair.
Common reasons for failure include a faulty oxygen sensor, a malfunctioning catalytic converter, a leak in the fuel system, or an engine control module problem. Some repairs are inexpensive (under $100), while others can cost several hundred dollars. The repair shop will diagnose the specific cause and give you an estimate before starting work.
After repairs are completed, you must return to a STAR station to retest. You can go to the same test-only station or a different one — the choice is yours. Bring your repair receipt with you, as some stations ask to see it. The retest fee is the same as the original test fee.
Cost and fees at STAR test-only stations
The smog check fee at a STAR test-only station ranges from roughly $30 to $50, depending on your vehicle type. Motorcycles, light-duty vehicles, and heavy-duty vehicles have different test procedures and different fees. The exact fee varies slightly by station and region, so call ahead or check the station's posted price if you want to know the exact amount.
The fee covers only the test itself. If you fail and need repairs, you pay the repair shop separately. If you need to retest after repairs, you pay the test fee again. There are no hidden fees or additional charges at STAR stations — the price you see is what you pay.
How to find a STAR test-only station near you
The California Bureau of Automotive Repair maintains an online locator tool on the official BAR website. Go to the BAR homepage, look for the "Find a STAR Station" link, and enter your city or ZIP code. The search results will show you all STAR stations in your area, including their addresses, phone numbers, and hours of operation.
You can filter the results to show only test-only stations if you prefer not to see combined facilities. The locator also shows which stations are currently open and whether they accept walk-ins or require appointments. Some test-only stations operate by appointment only, so calling ahead is a good idea, especially during peak smog check season (typically August through October).
If you cannot find a STAR station near you, you can also contact the Bureau of Automotive Repair directly by phone or through their website. They can direct you to the nearest test-only location and answer questions about fees, hours, or what to bring.
What to bring and how to prepare
Bring your vehicle registration and a valid photo ID. Make sure your registration is current — if it is expired, the station cannot test your vehicle. If you are retesting after repairs, bring your repair receipt so the technician knows you have had work done.
Before you go, make sure your vehicle is in reasonable running condition. If your check engine light is on, the station can still test you, but the result may be a conditional pass, which means you need to address the warning light before your next test. If your vehicle will not start or has obvious mechanical problems, the station may refuse to test until those issues are resolved.
Fill your gas tank before arriving if possible. Some test procedures require a minimum fuel level, and running out of gas during the test can delay results. Arrive with enough time before closing — do not show up five minutes before the station closes, as the technician may not have time to complete the full test.
Frequently Asked Questions
Can I retest at a different STAR station than the one where I failed?
Yes. You can retest at any STAR station, whether it is test-only or combined. You do not have to return to the same location. Bring your repair receipt with you so the technician knows you have had work done.
What if I pass the test but my check engine light is still on?
You will receive a conditional pass. This means your emissions are within limits, but your vehicle has a diagnostic trouble code that needs attention. You have until your next smog check to have that code addressed. A conditional pass is still a valid result for registration purposes.
How long does a smog check take at a test-only station?
Most tests take 15 to 30 minutes from arrival to result. Actual test time is usually 5 to 10 minutes, but you may wait if the station is busy. Calling ahead or arriving during off-peak hours can reduce wait time.
Do I need an appointment at a STAR test-only station?
Some test-only stations accept walk-ins, while others require appointments. Check the station's listing in the BAR locator tool or call ahead to confirm their policy. During peak season (late summer and early fall), appointments fill up quickly.
What if my vehicle fails again after I had it repaired?
Take the second fail result back to your repair shop. The technician can review the report, perform additional diagnostics, and determine whether the original repair was incomplete or whether a different system is causing the failure. You may not be charged for a second repair attempt if the first one did not solve the problem, depending on the shop's warranty policy.