Hj Smog

No. Hj Smog 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.

Hj Smog is open Monday 8 AM to 6 PM; Tuesday 8 AM to 6 PM; Wednesday 8 AM to 6 PM; Thursday 8 AM to 6 PM; Friday 8 AM to 6 PM; Saturday 10 AM to 2 PM; Sunday 10 AM to 2 PM. Hours can change on holidays, so call ahead if you are cutting it close.

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

Hj Smog accepts Cash, Credit Card.

Hj Smog has held a BAR smog license since 2025. You can verify the license status at bar.ca.gov.

Hj 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) 402-4491 for a quote.

Hj Smog does not take online bookings here, but walk-ins are welcome. Call (925) 402-4491 to check the wait.

Staff at Hj Smog 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 Hj Smog 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 Concord are Smog Guys (0.1 mi) and Lexus Of Concord (0.1 mi). Both are listed further up this page with their ratings and hours.