Star Certified Smog Check & Auto Repair

4300 Clayton Rd. Concord, CA 94521

Star Certified Smog Test and Repair Station in Concord, CA

Full Auto Repair Services | State-of-the-Art facility and Professional Technicians!

Schedule a Service

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Get $15 Off on SMOG
With Coupon Only, Cannot Be Combined With Any Other Offer. Must Print Coupon to Redeem.
Expires - 12/20/2024
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Get 10% Off Labor Only
On Repairs Over $100 or More
With Coupon Only, Cannot Be Combined With Any Other Offer. Must Print Coupon to Redeem.
Expires - 12/20/2024
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A/C Service For Only $79.95
Freon extra charge.
With Coupon Only. Cannot Be Combined With Any Other Offer. Must Print Coupon to Redeem.
Expires - 12/20/2024
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$50 Off Any Brake Repair
Any Brake Repair.
With Coupon Only, Cannot Be Combined With Any Other Offer. Must Print Coupon to Redeem.
Expires - 12/20/2024
coupon-image
$10 Off Oil Change
Get $10 Off Your Next Oil Change.
With Coupon Only. Cannot Be Combined With Any Other Offer. Must Print Coupon to Redeem.
Expires - 12/20/2024

Our Services

Star Certified Smog Check

Ensure your vehicle meets emissions standards with our Star Certified smog checks.

Brakes

Keep your vehicle running smoothly and safely with our expert brake services.

Oil Changes

Keep your vehicle running smoothly with timely oil changes tailored to your car's specific needs.

Check Engine Light Diagnostics

Quick and accurate check engine light diagnostics to identify issues, prevent damage, and keep your vehicle running smoothly.

Shocks & Suspension

Maintain a smooth ride and superior handling with our shocks and suspension services

Tune ups

Routine tune-ups are essential for maintaining your vehicle's peak performance Regular tune ups improve fuel efficiency, and extend your car's lifespan.

Star Certified smog check & auto repair in concord

Business Hours

What Can You Expect During A Smog Test?

In order to legally drive in California, you need to have a smog check on all your vehicles that are older than 6 years once every two years, or every year if you own a high-polluting vehicle. But how do smog tests work? How is the vehicle inspection actually done? Only licensed technicians are able to perform a vehicle inspection. They will need to attach some equipment to your vehicle to measure pollutants.

Visual Inspection

A certified technician will conduct a visual inspection of your vehicle’s emission control components. This includes checking the exhaust system, fuel system, and other related components for any signs of tampering or damage.

 

Tailpipe Emissions Test

This involves connecting a probe to the vehicle’s tailpipe to measure the levels of pollutants emitted during operation. The technician will run the vehicle at different speeds and loads to simulate driving conditions and measure emissions accordingly.

On-Board Diagnostics (OBD) Check

For newer vehicles, a diagnostic scanner is used to check for emissions system malfunctions. This scanner retrieves data related to the vehicle’s emissions system and checks for any trouble codes or malfunctions.

What Our Customers Say​

Attentive, knowledgeable, and attentive after sales service. Shaun and TJ quickly diagnosed the issue and repaired the work order same day. Reasonably priced! Next time I’ll remember to use their online coupons. Highly recommended…
Henry Liu

Trusted Smog Check and Auto Care in Concord, CA

We’re more than just a smog check station – we’re your one-stop shop for all your automotive needs. From routine maintenance to complex repairs, we do it all. Whether you’re due for an oil change, experiencing brake issues, or facing a stubborn check engine light, you can count on us to deliver reliable solutions and superior service.

 

Clayton Treat Automotive has been serving the Concord, CA community since 1997. As a Star Certified Test and Repair Station, we pride ourselves on offering exceptional service and expertise. Our state-of-the-art facility and professional technicians are dedicated to ensuring your complete satisfaction. We prioritize customer service above all else, striving to exceed your expectations with every visit.

We give top priority to customer satisfaction

We strive to satisfy each one of our customers.