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Plain-English answers about California smog checks: how long they last, who is exempt, what they cost and how to pass.

Learn before you test

Short, practical reads from the Blaze Smog team. Looking for the quick facts? Start with the California smog check guide.

A passing smog certificate is valid for 90 days. Here is how to time your test so it does not expire.

Gasoline cars 1975 and older, diesels 1997 and older, electric vehicles and newer gas cars. See who skips the smog check.

Most vehicles need a smog check every two years. Find out how to work out your own due date.

Station prices, the state certificate fee and other charges explained, with tips to avoid surprises.

A lit check engine light is an automatic failure. Here is what to do about it before you test.

After a battery change or code reset, your car needs to finish self-checks before it can pass smog.

Visual and functional checks, an onboard computer scan and, for older cars, a tailpipe test.

Sellers generally provide the smog certificate. Newer cars and some family transfers are treated differently.

What the smog abatement fee is, who pays it, and how it differs from other smog-related fees.

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