Diablo Auto Care

Yes. Diablo Auto Care 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.

No. Diablo Auto Care is licensed as a Test & Repair station. This station can run your smog test and, if the vehicle fails, diagnose and repair it in the same shop.

Diablo Auto Care is open Monday 8 AM to 6 PM; Tuesday 8 AM to 6 PM; Wednesday 8 AM to 6 PM; Thursday 8 AM to 6 PM; Friday 8 AM to 6 PM. Closed Saturday and Sunday. Hours can change on holidays, so call ahead if you are cutting it close.

Yes. Diablo Auto Care accepts walk-ins, so you can drive in without booking ahead.

Diablo Auto Care accepts Cash, Credit Card.

Diablo Auto Care has held a BAR smog license since 2002. You can verify the license status at bar.ca.gov.

Diablo Auto Care 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) 362-0101 for a quote.

Diablo Auto Care does not take online bookings here, but walk-ins are welcome. Call (925) 362-0101 to check the wait.

Staff at Diablo Auto Care 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.

Because Diablo Auto Care is a Test & Repair station, it can diagnose and repair the problem in the same shop, then run the free retest within 30 days. If the repair bill is steep, 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 Smog King. Both are listed further up this page with their ratings and hours.