Smog King

Yes. Smog King is STAR certified with the California Bureau of Automotive Repair, so it can test vehicles the DMV directs to a STAR station, including gross polluters.

Yes. Smog King is licensed as a Test Only smog station. This station performs the smog test and issues the certificate. It does not do repairs, so a failed vehicle has to be fixed elsewhere and brought back.

Smog King is open Monday 9 AM to 5 PM; Tuesday 9 AM to 5 PM; Wednesday 9 AM to 5 PM; Thursday 9 AM to 5 PM; Friday 9 AM to 5 PM; Saturday 9 AM to 5 PM; Sunday 9 AM to 2 PM. Hours can change on holidays, so call ahead if you are cutting it close.

Yes. Smog King accepts walk-ins, so you can drive in without booking ahead.

Smog King accepts Cash, Credit Card.

Smog King has held a BAR smog license since 2004. You can verify the license status at bar.ca.gov.

Smog King has not published a price on SmogCheckDeals. The Bureau of Automotive Repair puts the statewide average at $69.16 as of August 2026, about $65 for a 2000-or-newer vehicle and $73 for 1999-or-older, plus the $8.25 certificate fee. Call (925) 820-5665 for a quote.

Smog King does not take online bookings here, but walk-ins are welcome. Call (925) 820-5665 to check the wait.

Staff at Smog King speak English.

Bring the car, your registration or DMV renewal notice, and a way to pay. Most smog checks take 15 to 30 minutes, and most visits are closer to 20.

Smog King is a Test Only station, so it cannot do the repair. You would have the work done at a repair shop, then come back for the free retest within 30 days. California's Consumer Assistance Program covers up to $1,200 of emissions repairs for qualifying owners.

The closest alternatives in San Ramon are San Ramon Valley Import Center and Diablo Auto Care. Both are listed further up this page with their ratings and hours.