Every California smog check term and question, plainly defined

How is diesel smog different from gasoline?

Diesel checks use no tailpipe sniffer.

Per BAR diesel inspection requirements.

This entry also has a full Q&A treatment: smoganswers.com/q/how-is-diesel-smog-different-from-gasoline/

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Last reviewed 2026-05-25 · Cal Smog Network canonical answer library