Price
Call for price
Hours
Open Mon–Sat
Station type
Test Only
Appointments
Walk-ins welcome
Hours
- Monday
- 8:30 AM – 5 PM
- Tuesday
- 8:30 AM – 5 PM
- Wednesday
- 8:30 AM – 5 PM
- Thursday
- 8:30 AM – 5 PM
- Friday
- 8:30 AM – 5 PM
- Saturday
- 8:30 AM – 3 PM
- Sunday
- Closed
Good to know
Languages
English
Payment
Cash, Credit Card
What to expect at Certified Smog
Certified Smog is licensed by the Bureau of Automotive Repair as a Test Only smog station in Concord. It runs the inspection and issues the certificate but does no repairs. Its STAR certification is currently suspended in the BAR registry, so it cannot test DMV-directed vehicles until that is restored.
Walk-ins are welcome. Most smog checks take 15 to 30 minutes, and most visits are closer to 20.
What to bring
Your registration or DMV renewal notice
It says whether the car needs a STAR station.
The car, with the check engine light off
On a 2000-or-newer car, a lit check engine light fails the test on its own.
A way to pay
The $8.25 state certificate is paid on top of the test when the car passes, unless the station's price or coupon includes it.
What if I fail?
- Certified Smog doesn't do repairs, so the car goes to a repair shop and comes back for the retest.
- Each station sets its own retest price, so ask before the first test.
- BAR's Consumer Assistance Program pays up to $1,450 toward emissions repairs for income-eligible owners.
2898 Willow Pass Road, Concord, CA 94519
Get directions →Hours
- Monday
- 8:30 AM – 5 PM
- Tuesday
- 8:30 AM – 5 PM
- Wednesday
- 8:30 AM – 5 PM
- Thursday
- 8:30 AM – 5 PM
- Friday
- 8:30 AM – 5 PM
- Saturday
- 8:30 AM – 3 PM
- Sunday
- Closed
Other stations near Certified Smog
Nearby cities in Contra Costa County
Questions about Certified Smog
Certified Smog 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 3 PM. Closed Sunday. Hours can change on holidays, so call ahead if you are cutting it close.
Certified Smog accepts Cash, Credit Card.
Certified Smog has held a BAR smog license since 2025. You can verify the license status at bar.ca.gov.
Certified Smog 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) 483-7555 for a quote.
Certified Smog does not take online bookings here, but walk-ins are welcome. Call (925) 483-7555 to check the wait.
Staff at Certified Smog speak English.
The closest alternatives in Concord are Bayside Smog (0.1 mi) and Mekatron Concord (0.8 mi). Both are listed further up this page with their ratings and hours.
How we get this data: BAR licenses and STAR status, Google hours and ratings, coupons published by the station.
Verify this station’s license and STAR standing at bar.ca.gov.
Own this shop? Add photos
BAR field office: Hercules • Licensed since 2025