Smog Star Express

Yes. Smog Star Express 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 Star Express is open Monday 8:30 AM to 5:30 PM; Tuesday 8:30 AM to 5:30 PM; Wednesday 8:30 AM to 5:30 PM; Thursday 8:30 AM to 5:30 PM; Friday 8:30 AM to 5 PM; Saturday 9 AM to 4 PM; Sunday 10 AM to 3 PM. Hours can change on holidays, so call ahead if you are cutting it close.

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

Smog Star Express accepts Cash, Credit Card.

Smog Star Express has held a BAR smog license since 2026. You can verify the license status at bar.ca.gov.

Smog Star Express 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) 938-3315 for a quote.

Smog Star Express does not take online bookings here, but walk-ins are welcome. Call (925) 938-3315 to check the wait.

Staff at Smog Star Express 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 Star Express 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 Walnut Creek are N Service Auto Repair & Service (0.5 mi) and Walnut Creek Honda (0.7 mi). Both are listed further up this page with their ratings and hours.