Smog Check 101

What Is a STAR Smog Station?

Not every smog check station in California can test every vehicle. STAR certification is what determines whether a station can.

California's Bureau of Automotive Repair (BAR) certifies smog check stations into different tiers based on the equipment and training they have. A STAR station is certified for the full range of testing, including STAR-directed tests assigned to specific vehicles, often ones flagged for a prior failure, high-emissions history, or as part of random program assignment.

Why the distinction matters to you

If your renewal notice from the state says your smog check must be a "STAR-directed" test, it has to happen at a STAR station. A regular Test-Only or Test & Repair station that isn't STAR-certified can't legally perform it. Showing up at the wrong type of station means a wasted trip.

What a STAR station can test

• STAR Smog Check: Regular & STAR-directed vehicle testing for your state-required emissions check or a change of ownership.
• Gross Polluter vehicles: STAR station testing for vehicles flagged as gross polluters or previously failed smog checks.
• Hybrid & Diesel vehicles: Specialized testing for hybrid and diesel vehicles, which follow their own inspection requirements.
• Out-of-State Vehicles: Bringing a vehicle into California? We handle the out-of-state smog inspection the state requires.
• RVs, Trucks & Minivans: Larger vehicles welcome. We test RVs, trucks, and minivans in addition to passenger cars.

How to check what your vehicle needs

Your renewal notice from the state will tell you whether a regular or STAR-directed smog check is required. If you're not sure, we can look it up when you call or when you arrive. Walk-ins are welcome during business hours.