Every California smog check term and question, plainly defined

Do I need a smog check when selling my car?

Yes — the seller is responsible if the vehicle is over 4 years old.

Per California DMV registration rules.

This entry also has a full Q&A treatment: smoganswers.com/q/do-i-need-a-smog-check-when-selling-my-car/

View in the A–Z glossary →

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