Guys Smog

Yes. Guys Smog Inc 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. Guys Smog Inc 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.

Guys Smog Inc is open Monday 8 AM to 4 PM; Tuesday 8 AM to 4 PM; Wednesday 8 AM to 4 PM; Thursday 8 AM to 4 PM; Friday 8 AM to 4 PM. Closed Saturday and Sunday. Hours can change on holidays, so call ahead if you are cutting it close.

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

Guys Smog Inc accepts Cash, Credit Card.

Guys Smog Inc has held a BAR smog license since 2012. You can verify the license status at bar.ca.gov.

Guys Smog Inc 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) 229-3800 for a quote.

Guys Smog Inc does not take online bookings here, but walk-ins are welcome. Call (925) 229-3800 to check the wait.

Staff at Guys Smog Inc 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 Guys Smog Inc 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 Martinez are Robert's Auto Care And Fleet Service (1.4 mi) and Contra Costa Electric Inc (1.6 mi). Both are listed further up this page with their ratings and hours.