Smog Check - ALL STAR SMOG Vallejo

We don’t service, diagnose, or repair any vehicles, including those requiring a California smog test or a diesel smog check. Our focus is solely on providing a thorough smog inspection.

In California, a smog inspection is necessary when you register or renew your vehicle registration. However, there are certain exceptions. For instance, if your gasoline-powered vehicle is a 1975 model or older, including motorcycles and trailers, you will not need to undergo the California smog test. Additionally, it's important to note that diesel vehicles may require a diesel smog check under different regulations.

The California smog test for diesel vehicles will involve a visual inspection of your emissions and smog components, a system check of the On Board Diagnostics (OBD II) system, a visual smoke check for excessive black (carbon) smoke, and an EVAP functional test. Diesel cars and trucks that do not pass the diesel smog check will need to be repaired at a diesel vehicle repair shop prior to undergoing another smog inspection.

All of our California smog tests, including the diesel smog check, come with a certification. 

 When your DMV renewal notice says a smog check is required, we can test your vehicle and send the results to the DMV electronically. Bring your renewal notice and registration, and walk in any time during business hours. No appointment needed. 

 Selling a vehicle? In most cases, California requires a current smog certificate when ownership changes. We test quickly and provide the certification you need to complete the sale. Bring your registration and keys. 

 Moving to California with your vehicle? Most vehicles brought in from out of state need a California smog check before they can be registered. We’re a STAR Certified Test-Only station and can test your vehicle the same day. Not sure what applies to yours? Call us at (707) 731-9954.