Every grade on SmogFinder comes from official California state inspection records — data that's always been public, but buried where car owners never see it. Here's how to read it.
The California Bureau of Automotive Repair (BAR) is the state agency that licenses and monitors every smog check station. BAR tracks how each station — and each individual inspector — performs, and publishes a STAR Report Card for every station.
Most drivers have never seen one. SmogFinder puts that report card front and center.
BAR's core quality measure is the Follow-up Pass Rate (FPR), scored 0.00 to 1.00 for each inspector. It estimates how likely it is that vehicles an inspector passes would also pass a follow-up inspection — in other words, how thorough and honest their inspections are.
Higher is better. An inspector at 0.90 is passing cars that genuinely pass. A very low FPR can mean rubber-stamping. BAR updates FPR scores twice a year, in January and July.
We convert FPR to a 0–100 score (FPR × 100) and grade it. The scale is anchored to the state's own bar: an FPR of 0.40 — a score of 40 — is the minimum for STAR certification.
A station's grade is its best inspector's score — one weak inspector shouldn't sink a shop where you can ask for the good one. The range shows the spread.
Inspectors at the same shop can score wildly differently — we've seen shops with one inspector at 0.93 and another at 0.19. Your experience depends on who runs your test. When a station shows a wide range (like “F–A”), it can be worth asking for the higher-scoring inspector by name — every station page lists them.
★ STAR certifiedstations meet BAR's stricter performance standards and are the only ones allowed to smog-test certain DMV-directed vehicles. Certification requires applying — a good station isn't automatically STAR.
⚠ Enforcement flags(“On probation”, “Accusation filed”) mean BAR has taken or is pursuing disciplinary action. We show them even when the station's scores look good.
Everything is sourced from BAR's public records: the state station directory and each station's STAR Report Card. We refresh station data weekly and scores on BAR's January/July cycle. You can view any station's official report card at bar.ca.gov.
SmogFinder is not affiliated with the State of California. Grades summarize public BAR data to help you choose — they aren't a guarantee of any individual inspection.
Your BAR scores are already public — SmogFinder just makes them visible to the drivers choosing a station. A strong score is your best advertising, and it's free.
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