Emissions Inspection in California: Requirements, Cost & Exemptions
Whether you're buying, selling, or renewing registration in California, here's exactly what the emissions inspection program requires and what it costs.
Quick Reference
Is It Required?
Yes — Smog Check required
California Smog Check Program applies to gasoline vehicles 1976 and newer. Diesel vehicles 1998+ over 14,000 GVWR require testing. Required at sale and biennially.
Counties Affected
All urban counties + many suburban (52 of 58 counties)
Most California counties require Smog Check. Some rural counties (Alpine, Modoc, Mariposa, Plumas, Sierra, Trinity) are exempt.
Test Types
- ASM (Acceleration Simulation Mode) for 2000-newer gasoline
- OBD-II only for 2000+ vehicles
- Visual inspection of emissions equipment
- Smoke opacity test for diesel
Cost & What to Expect
Typical cost: $30–$80 depending on smog station
Test-only stations cost less ($30–$50). Test-and-repair stations cost more ($50–$80) but can fix issues on-site.
Exemptions
- Vehicles older than 1975 (pre-OBDII)
- Hybrid vehicles built before 2000
- Electric vehicles (BEV)
- Motorcycles
- Diesel vehicles 1997 and older
- Vehicles in non-program counties
If Your Vehicle Fails
CAP (Consumer Assistance Program) offers $500–$1,200 toward repairs
If your vehicle fails and income qualifies, the BAR CAP program provides up to $1,200 in repair assistance or $1,500 to retire the vehicle.
California Standout Rule
Frequently Asked Questions
Is emissions inspection required in California?
Yes — Smog Check required. California Smog Check Program applies to gasoline vehicles 1976 and newer. Diesel vehicles 1998+ over 14,000 GVWR require testing. Required at sale and biennially.
How often do I need an emissions test in California?
Every 2 years for registration; at every vehicle sale. Smog Check is part of biennial registration renewal in affected counties. Sellers must provide a passing smog certificate not more than 90 days old at sale.
How much does an emissions inspection cost in California?
$30–$80 depending on smog station. Test-only stations cost less ($30–$50). Test-and-repair stations cost more ($50–$80) but can fix issues on-site.
Who is exempt from emissions testing in California?
Exempt categories include: Vehicles older than 1975 (pre-OBDII), Hybrid vehicles built before 2000, Electric vehicles (BEV), and others. See full list on the official agency site.
What happens if my vehicle fails emissions in California?
CAP (Consumer Assistance Program) offers $500–$1,200 toward repairs. If your vehicle fails and income qualifies, the BAR CAP program provides up to $1,200 in repair assistance or $1,500 to retire the vehicle.
Selling After Passing Inspection?
A compliant California bill of sale lets you transfer ownership cleanly after your vehicle passes its inspection.
Generate Bill of SaleSource: California Bureau of Automotive Repair (BAR). Emissions rules change periodically — verify current requirements before scheduling a test.