Sonoma Auto Tech

No. Sonoma Auto Tech is not STAR certified. If your DMV renewal notice says "STAR Station Required," you will need to visit a STAR certified station instead.

No. Sonoma Auto Tech 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.

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

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

Sonoma Auto Tech accepts Cash, Credit Card.

Sonoma Auto Tech has held a BAR smog license since 2020. You can verify the license status at bar.ca.gov.

Sonoma Auto Tech 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) 643-4373 for a quote.

Sonoma Auto Tech does not take online bookings here, but walk-ins are welcome. Call (707) 643-4373 to check the wait.

Staff at Sonoma Auto Tech 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 Sonoma Auto Tech 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 Marin Smog and Vallejo Smog Dog (0.3 mi). Both are listed further up this page with their ratings and hours.