Test-Only vs. Test-and-Repair Smog Stations: What's the Difference
Every station in this directory is tagged with what it's licensed to do: Smog Test, Smog Repair, or both. The distinction matters more than it might seem.
Why does "test-only" exist at all?
A station that both tests your car and profits from repairing it has an obvious conflict of interest when it comes to certain higher-polluting vehicles — there's a financial incentive to pass a car that shouldn't pass, or to fail one that's fine and sell unnecessary repairs. California's Smog Check program addresses this by requiring some vehicles to be tested at stations that are licensed for testing only and cannot perform repairs, removing that incentive completely for the vehicles most likely to be affected by it.
What are test-and-repair stations?
Most stations are licensed for both, which is generally more convenient for routine renewals: if your car fails, the same shop can often diagnose and fix the problem and retest you without a second stop. Whether that convenience is right for you also depends on price — see our cost guide for how to compare stations.
How many visits will this take?
| Station type | If you pass | If you fail |
|---|---|---|
| Test-and-repair | 1 visit | Usually 2 — same shop repairs and retests. |
| Test-only | 1 visit | 3 — separate repair shop, then back to the original (or another) station to retest. |
Test-only stations trade that extra step for the conflict-of-interest protection described above — worth factoring in if your vehicle isn't actually required to use one and you'd rather minimize trips.
How do I know which type I'm required to use?
Your DMV renewal notice will say if you're required to use a specific station type — this typically applies to vehicles flagged for closer scrutiny rather than to routine renewals. If your notice doesn't specify, you can choose either type freely.
How do I find the right station?
Every listing on city pages and search results shows its badges up front, so you can filter for test-and-repair convenience or a dedicated test-only station without calling ahead to ask. STAR certification (see our STAR guide) is tracked separately from repair capability — check both badges if your renewal notice requires a specific combination.
Glossary
- STAR
- California's higher-standard certification tier for smog check stations, reserved for stations that meet stricter equipment, training, and performance requirements set by BAR.
- ARD
- Automotive Repair Dealer — the registration/license type a business holds with BAR. The ARD number shown as “ARD #” on every listing on this site is that station's official BAR identifier.