A.R.S. § 28-955: Muffler Requirements
Mufflers; noise and air pollution prevention; emissions control devices; civil penalty; exception
What are Arizona's muffler requirements for vehicles?
In Arizona, a motor vehicle must have a working muffler at all times to prevent excessive noise, may not use a muffler cutout or bypass device on a highway, and must limit excessive fumes or smoke; vehicles from the 1968 model year onward must also have emissions control devices meeting state standards. Violators face a civil penalty of at least $100, though electric vehicles are exempt.
Full statute text
Official text last checked against azleg.gov:
28-955. Mufflers; noise and air pollution prevention; emissions control devices; civil penalty; exception
A. A motor vehicle shall be equipped at all times with a muffler that is in good working order and that is in constant operation to prevent excessive or unusual noise.
B. A person shall not use a muffler cutout, bypass or similar device on a motor vehicle on a highway.
C. The engine and power mechanism of a motor vehicle shall be equipped and adjusted to prevent the escape of excessive fumes or smoke.
D. Beginning with motor vehicles and motor vehicle engines of the 1968 model year, motor vehicles and motor vehicle engines shall be equipped with emissions control devices that meet the standards established by the director of environmental quality.
E. A person who violates this section is subject to a civil penalty of at least one hundred dollars.
F. This section does not apply to an electrically powered motor vehicle.
AI-drafted summary, not attorney-reviewed. Statute text verified against azleg.gov. Legal information, not legal advice — consult a licensed attorney for your situation.