Clayton-Treat Automotive

Clayton-Treat Automotive, 4300 Clayton Rd, Concord, California 94521, is a smog inspection station and auto repair shop that handles emissions testing and repairs. They perform OBD-II testing for passenger cars and offer repairs like catalytic converter, exhaust, and O2 sensor work. The shop is STAR certified in California, and they accept walk-ins during posted hours. Opening hours include Monday through Saturday 9 am to 5 pm and Thursday until 4:30 pm. Reviews highlight fast, friendly service and fair pricing, plus free retests after a pass. Clean facility, clear explanations, and reliable service for emissions testing and car care.

Smog inspection station

Test and Repair

Concord, CA

Contact

Address 4300 Clayton Rd, Concord, CA 94521, United States

Phone +1 925-682-4300

Website http://www.claytontreatauto.com/

Hours

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

Services

Station Type Test and Repair

Test Types

OBD-II

Vehicles Served

Passenger Cars

STAR Certified Yes

Languages English

Practical Information

Appointments Walk-ins Welcome

Typical Wait 30-60 minutes

Pricing Contact for pricing

Retest Policy Free Retest

Rating

4.4 / 5

Based on 98 reviews

4.4 / 5

Smog Check rating (25 reviews)

Location

Concord, California

More stations in Concord

What Customers Say

Friendly Staff Knowledgeable Easy Process Good Communication

Speed: Fast

Pass Rate

Standard

Based on customer review sentiment

Making the Most of Your Visit to Clayton-Treat Automotive

Choosing the right smog check station in Concord, California can save you time, reduce stress, and help ensure your vehicle passes its inspection on the first try. Clayton-Treat Automotive is one of the licensed smog check locations in the area, and preparing properly before your visit can make the process smoother.

Understanding California Smog Check Requirements

Smog Check rules in California vary by vehicle type, registration ZIP code, and model year. Since requirements can differ even within Concord, confirm what applies to you before heading to Clayton-Treat Automotive. Our California Smog Check guide outlines current rules, exemptions, and testing intervals.

Before Your Smog Check

To help make your smog check quick and successful, consider preparing the following:

Confirm your registration address requires testing.
Ensure your check engine light is off and no recent codes have been cleared.
Warm up your vehicle by driving 10 to 15 minutes before testing.
Bring your registration or renewal notice and a valid photo ID.

Why Reviews Matter

Customer experiences can vary, so reading feedback from other drivers can help you understand what to expect. Clayton-Treat Automotive currently has 98 reviews with a 4.4 out of 5 rating, which can provide insights into service quality, wait times, and professionalism.

Visit Checklist

1

Verify Certification

Ensure Clayton-Treat Automotive is an active, licensed smog check station in California.
2

Check Reviews

Read recent customer feedback from other Concord drivers to understand typical wait times and service quality.
3

Confirm Services

Call ahead to confirm the types of tests offered and whether appointments are required.
4

Bring Required Documents

Have your registration or renewal notice, ID, and any required paperwork ready when visiting the station.
5

Ask About Retest Policies

Clayton-Treat Automotive offers a Free Retest policy. Confirm details up front in case your vehicle needs a retest.

* This guide is for informational purposes only. Always confirm smog check requirements and policies with your local California authorities.

FAQ

Common questions

Have a question not covered here? Contact us and we will respond within one business day.

Where is Clayton-Treat Automotive located?

Clayton-Treat Automotive is located at 4300 Clayton Rd, Concord, CA 94521, United States in Concord, California.

What services does Clayton-Treat Automotive offer?

Clayton-Treat Automotive is categorized as a Smog inspection station and operates as a Test and Repair station offering OBD-II testing for passenger cars.

Does Clayton-Treat Automotive provide Smog Check?

Yes, Clayton-Treat Automotive provides Smog Check in Concord, CA. Available test types include OBD-II.

What are the hours for Clayton-Treat Automotive?

Clayton-Treat Automotive is open: 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.

How can I contact Clayton-Treat Automotive?

You can reach Clayton-Treat Automotive by phone at +1 925-682-4300, online at http://www.claytontreatauto.com/, or by visiting 4300 Clayton Rd, Concord, CA 94521, United States.

Do I need an appointment at Clayton-Treat Automotive?

Clayton-Treat Automotive accepts walk-ins with no appointment necessary. Contact them directly to confirm availability.

How long does Smog Check take at Clayton-Treat Automotive?

Typical wait time at Clayton-Treat Automotive is 30-60 minutes. Customers generally describe the service speed as Fast.

What do customers say about Clayton-Treat Automotive?

Clayton-Treat Automotive has a 4.4 out of 5 rating based on 98 reviews. Customers frequently mention friendly staff, knowledgeable, easy process, good communication. For Smog Check specifically, they hold a 4.4 out of 5 rating.

What happens if my vehicle fails the Smog Check at Clayton-Treat Automotive?