4300 Clayton Rd. Concord, California 94521

Star Certified Smog Test and Repair Station in Concord, CA

We Service all makes and models - Foreign & Domestic!

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26 Years of Trusted Smog Check and Auto Care

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.

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.

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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.

 

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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.

Connected air conditioning station for diagnostic of freon level in the car conditioner system

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

Our Services

Smog Check Star Certified

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

Brakes & Tune-up

Keep your vehicle running smoothly and safely with our expert brake services and comprehensive tune-ups.

A/C Service

Stay cool on the road with our professional air conditioning services.

Engine Diagnosis & Repair​​

Check the health status of your engine with our equipments for repairs

Shocks & Suspension

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

30K, 60K, 90K Service

Keep your vehicle running like new with our comprehensive maintenance services tailored to your manufacturer's recommendations.

We Provide Trusted Services For You

Satisfaction Guaranteed or Your Money Back