Clayton-Treat Automotive

Smog inspection station

4.4 4.4 from 103 reviews

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Clayton-Treat Automotive is a smog and emissions station in Concord, CA. It holds a 4.4 star rating from 103 customer reviews. Read the reviews and hours below, or call (925) 682-4300.

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Address4300 Clayton Rd, Concord, CA 94521

MapOpen the map →

Phone(925) 682-4300

Websitehttp://www.claytontreatauto.com/

Also onGoogle Yelp

LicenseCalifornia BAR ARD 206236Active on the state's licensee list (October 2026), registered since 1999 or earlier

Smog checkLicensed smog station, Test & Repair (206236)

Hours

See the full week

Monday	9 AM–5 PM
Tuesday	9 AM–5 PM
Wednesday	9 AM–5 PM
Thursday	9 AM–4:30 PM
Friday	9 AM–5 PM
Saturday	9 AM–5 PM
Sunday	Closed

Clayton-Treat Automotive Reviews & Ratings

Customer reviews 4.4 4.4 · 103 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