California Car Inspection Laws
Requirements, costs, what gets checked, and what it means when buying or selling a vehicle in California.
California requires a smog check (emissions) for most vehicles but does not have a statewide safety inspection program for registration renewal.
Inspection at a Glance
What Gets Checked
- ✓Emissions (smog check)
- ✓OBD-II system scan
- ✓Visual smoke test
- ✓Fuel cap integrity
California has some of the strictest emissions standards in the country. When selling a vehicle, sellers must provide a valid smog certificate (issued within 90 days) unless the buyer is a licensed dealer.
Inspection and Vehicle Sales in California
Whether the vehicle passed or failed, disclose the current inspection status to buyers. Include it in your bill of sale for legal protection.
A signed bill of sale noting the vehicle's inspection status — and that the buyer accepts it — protects you from post-sale disputes.
Even where inspections are not legally required, buyers should always request a pre-purchase inspection by an independent mechanic before finalizing any used vehicle sale.
Frequently Asked Questions
Does California require a car inspection to sell a vehicle?
California requires a smog check (emissions) for most vehicles but does not have a statewide safety inspection program for registration renewal.
How often is vehicle inspection required in California?
Biennial smog check required for most gasoline vehicles over 8 model years old in certain counties.
How much does a car inspection cost in California?
Smog check costs vary by station. A certificate of compliance is required before registration renewal.
Does California require emissions testing?
Most counties require smog checks. Vehicles 8 years old or newer in most areas are exempt.
What happens if a car fails inspection in California?
If a vehicle fails inspection in California, you typically have a set period to make repairs and re-test. Driving with a failed or expired inspection sticker may result in fines. Contact California DMV for specific reinspection rules.
Can I sell a car that failed inspection in California?
In most states including California, you can sell a vehicle that has failed inspection — but you must disclose the failure to the buyer. Many buyers will negotiate a price reduction to cover repairs. Using a bill of sale that notes the condition protects both parties.