Utah Emissions Inspections

Utah State Law requires vehicle Emissions tests every 2 years for vehicles less than 6 years old.

2021 Emission Inspection Requirements

tailpipes on a carVehicle Model Year Emission Inspection
2021 Not required
2020 Not required
2019 Required
2018 Not required
2017 Required
2016 Not required
2015 to 1968 Required
1968 and older Not required

Time for an emissions check?

Come into Master Muffler and we’ll take care of that for you.

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Signs To Watch For

If your check engine light is on, your car will not pass inspection. Before doing any testing, any issues involving the check engine light must be addressed. If your check engine light is on, our full-service shop can quickly diagnose the problem and repair it for you, before performing the state inspection.

Good for Us, Good for the Environment

Despite all the good that has come from spending so much time in and around our cars, we have had to open ourselves to the greater impact that cars have on our planet. In 1970, the United States Congress passed the Clean Air Act, a piece of legislation designed to cut down on the amount of harmful emissions that things like cars and factories are putting into the atmosphere. 

One of the ways that the Environmental Protection Agency has tried to reduce pollution is by requiring all cars to undergo an emissions test in order to qualify for registration. Typically, this requires taking your vehicle to a mechanic, like those in our Provo car repair center, and having them hook up a diagnostic device to the tailpipe or to the port at the base of the steering column and perform checks on the car’s various emissions systems. These systems — usually housed in the engine control module (ECM) — run continuous checks on:

  • The catalytic converter
  • The transmission
  • The engine
  • The fuel system

The ECM makes sure that the car is operating at the best fuel economy and that the most hazardous pollutants are being processed by the catalytic converter. To pass an emissions test, these systems must be in peak working condition.

How the Emissions System Works

Unless your car or truck runs off of electricity, every vehicle with a traditional internal combustion engine will produce emissions. This is because liquid gas or diesel is converted into a vapor, mixed with air, and heated to the point of combustion, at which point it is passed through various components until it is expelled out the tailpipe. Understanding the various parts of the emissions system will help shed light on what our Master Muffler technicians will be inspecting when the car fails to pass emissions testing.

Components include:

  • Exhaust Manifold: As the engine creates a controlled explosion of the gas and air, the resultant fumes must be directed somewhere. They are pushed out of the engine cylinder and through the exhaust manifold, which directs the fumes onward to the back of the vehicle.
  • Oxygen Sensor: The 02 sensor gathers real-time data about the amount of unburnt oxygen that exists in the heated fumes leftover from the combustion. Depending on what the sensor reads, it sends instructions to the carburetor to adjust the mixture of air and fuel for the engine. Without this information, the car might inject a mixture that is harmful to the engine and whose fumes are bad for the environment.
  • Catalytic Converter: An essential component that should always be brought in for car repairs, should the need arise. The catalytic converter converts much of the highly polluted engine exhaust from carbon monoxide into carbon dioxide, while other elements turn to water vapor. 
  • Muffler and Resonator: The work of these two car parts is to dampen and change the sound of the engine so as not to hurt the ears of those inside the car or those on the street next to it.
  • Tailpipe: The final stretch of the whole emissions system. The tailpipe provides an exit for all these fumes to leave the car.

The Master Muffler Provo

Here At Master Muffler Provo, we’ll make sure that your emissions are done correctly. If there are any issues with your vehicle we can work them for you or refer you to someone who can. We’ll also be able to let you know if there are any issues that you should be aware of in the near future. Come see what makes us different.

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