Smog Checks in St. Louis

*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 Marty's Auto Shop in St. Louis for Your Smog Testing and Repair

  • Specialized smog check service station in St. Louis
  • 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

St. Louis's Trusted Source for Smog Testing and Repair

Ask any car or truck owner in St. Louis who they recommend for smog testing and repair, and they will tell you Marty's Auto Shop.

Since 1977, the pro mechanics at Marty's Auto Shop 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 Marty's Auto Shop at 314-631-9171 to schedule an appointment today or stop by our location at 9700 Gravois Rd in St. Louis, MO, 63123.

What Does Marty's Auto Shop 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, Marty's Auto Shop 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, Marty's Auto Shop will provide you a vehicle inspection report showing your vehicle's results and will electronically send the smog certificate to DMV.

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