HJ Smog

Smog inspection station

4.8 4.8 from 382 reviews

HJ Smog is a smog and emissions station in Concord, CA. It holds a 4.8 star rating from 382 customer reviews. Read the reviews and hours below, or call (925) 402-4491.

Photo from this business's Google profile.

Address2111 Fremont St Unit C, Concord, CA 94520

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Phone(925) 402-4491

Websitehttps://www.concordsmogcheck.com/

Also onGoogle Yelp

LicenseCalifornia BAR ARD 314814Active on the state's licensee list (October 2026), registered since 2025

Smog checkLicensed smog station, Test & Repair (314814)

Hours

See the full week

Monday	8 AM–6 PM
Tuesday	8 AM–6 PM
Wednesday	8 AM–6 PM
Thursday	8 AM–6 PM
Friday	8 AM–6 PM
Saturday	10 AM–2 PM
Sunday	10 AM–2 PM

HJ Smog Reviews & Ratings

Customer reviews 4.8 4.8 · 382 reviews

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What Car Repairs Cost in Concord, CA

Typical independent shop prices at California labor rates, parts and labor, for a midsize car. Each guide shows the price for your vehicle and what to ask before you pay. See all 91 repair cost guides.

Catalytic converter replacement cost $420 to $1,750 Oxygen sensor replacement cost $120 to $510 EVAP leak repair cost $140 to $740 EGR valve replacement cost $210 to $840 Purge valve replacement cost $110 to $460 Exhaust leak repair cost $150 to $690