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Smog Check: Testing and Repairs

Smog Checks in Pasadena

*Please bring your DMV renewal notice indicating a Smog Check is required with you and your Smog Check certificate will be electronically sent to the DMV.

Why Choose Walnut Smog and Repair in Pasadena for Your Smog Testing and Repair

  • Specialized smog check service station in Pasadena
  • Smog test and repair options to minimize cost and maximize convenience
  • Smog failure diagnosis with onsite repair and smog retesting
  • State-of-the-art automotive smog repair systems and tools
  • We participate in the California State Free Smog Testing Program
  • Ask about smog repair discounts and coupons

Pasadena's Trusted Source for Smog Testing and Repair

Ask any car or truck owner in Pasadena who they recommend for smog testing and repair, and they will tell you Walnut Smog and Repair.

Since 1999, the pro mechanics at Walnut Smog and Repair have provided quick smog testing and cost-effective smog repairs when needed. Start a maintenance service plan with us that can help prevent high-cost repairs to your emission system. We are professional, honest, and friendly. For five star, cost conscious smog testing and repair services call Walnut Smog and Repair at 626-449-6252 to schedule an appointment today or stop by our location at 1323 E Walnut St #2 in Pasadena, CA, 91106.

What Does Walnut Smog and Repair Do During a Smog Check?

We inspect your car or truck's emissions-control equipment to measure the number of pollutants your vehicle is emitting.

First, Walnut Smog and Repair will analyze your car or truck's OBD computer system, emissions-control system, and check engine light codes for standard warnings that your emissions system is no longer functioning properly.

Next, we will inspect your car or truck's gas cap, ignition timing, exhaust gas recirculation system, fuel, and evaporative system.

Finally, we will perform a Tailpipe Emissions Inspection which measures the type and quantity of any pollutant emitted from your vehicle's tailpipe.

Did You Pass Your Smog Test?

Great! If your vehicle passes a smog check, Walnut Smog and Repair will provide you a vehicle inspection report showing your vehicle's results and will electronically send the smog certificate to DMV.

Smog Check Repairs
If your car fails the smog test, don't worry-Walnut Smog and Repair is here to help. We will collaborate with you to perform the necessary repairs to ensure your vehicle passes the smog test and you receive your certification. Learn more about smog check repairs.

Smog Testing vs. Emissions Testing
Many customers confuse smog and emissions testing, thinking they're the same, but they measure different things. Smog checks and emissions tests assess various levels of hydrocarbons, oxygen, carbon monoxide, and oxides to determine a vehicle's impact on the environment. Discover the difference between smog testing and emissions testing.

Discover More About Exhaust Repair Services At Walnut Smog and Repair in Pasadena

Emissions And Smog Testing
Learn more about Smog Checks vs Emissions Testing
Inspections & Emissions

Contact Us Today!

Got questions? We've got answers! Drop us a line, give us a call, or even stop by. Our team is eager to help you with any auto repair needs you have. Let's get you back on the road safely and swiftly!

What Our Customers Are Saying

Great service the gentleman is very king and professional provides great service and your in and out quickly, I recommend this place.

Inspections and Emissions, near Pasadena, CA

, 09/05/2025

My 2015 Nissan Rogue was due for its Smog Check. My check engine light was on when I brought it in. I had the light checked at auto supply store and they said that the oxygen sensor was bad. Arthur looked at the printout paperwork and said that that may not be the problem. He popped the hood and he found the problem within less than a minute. One of the hoses was not connected to the engine. After another diagnostic check found that there may another issue but suggest that I drive a few miles to reset the emissions computer. After I drove the recommended miles I had the car smog check and it passed. I've brought in a number of cars we've had to Arthur. He is very honest, friendly and knowledgeable. I highly recommend anyone to bring their vehicle to this establishment. Definitely 5 stars.

Inspections and Emissions

, 08/14/2025

Service was very fast for my 2016 Avalon. The facility was clean with comfortable seating. Highly recommend this place for your smog check needs!

Inspections and Emissions, near Pasadena, CA

, 06/05/2024

Easy, Fast, and professional. I was in and out in under 10 minutes.

Inspections and Emissions, near Pasadena, CA

, 10/25/2023

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