Royal Smog & Mechanic

Yes. Royal Smog & Mechanic 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. Royal Smog & Mechanic 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.

Royal Smog & Mechanic is open Monday 8:30 AM to 5 PM; Tuesday 8:30 AM to 5 PM; Wednesday 8:30 AM to 5 PM; Thursday 8:30 AM to 5 PM; Friday 8:30 AM to 5 PM; Saturday 8:30 AM to 5 PM. Closed Sunday. Hours can change on holidays, so call ahead if you are cutting it close.

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

Royal Smog & Mechanic accepts Cash, Credit Card.

Royal Smog & Mechanic has held a BAR smog license since 2019. You can verify the license status at bar.ca.gov.

Royal Smog & Mechanic 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 (707) 917-6107 for a quote.

Royal Smog & Mechanic does not take online bookings here, but walk-ins are welcome. Call (707) 917-6107 to check the wait.

Staff at Royal Smog & Mechanic 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 Royal Smog & Mechanic 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 Vallejo are Ocm Auto Repair (0.1 mi) and Vallejo Smog (0.2 mi). Both are listed further up this page with their ratings and hours.