Muffler, Exhaust System and Trailer Venting

19VAC30-70-300. Muffler, exhaust system and trailer venting.
A. Flexible tubing may be used anywhere in the exhaust system.
B. Inspection of exhaust system does not concern noise level.
C. Inspect for and reject if:

  • 1. There is any leakage of exhaust gases at any point in the system. Do not reject “builtin”
    drain holes in muffler or tailpipe.
  • 2. A muffler or catalytic converter has been repaired in any manner. The exhaust pipe
    may be welded to the muffler or catalytic converter. Holes or cracks in the exhaust line
    have been repaired with a patch or caulking.


Revised August 1, 2012

19VAC30-70- Motor Vehicle Safety Inspection Rules And Regulations

  • NOTE: If a vehicle is inspected that does not have a muffler, the inspector should
    explain to the customer that although the vehicle will pass inspection without a muffler, it
    is a violation of state law for the vehicle to be operated on the highway without it.
    NOTE: Nissan has designed an exhaust repair for leak/noise at the front tube for the
    2002-03 Nissan Pathfinders. The repair may require the application of a specially
    designed caulk to the front tube of the exhaust system. Since Nissan has designed the
    repair for their vehicles and trained Nissan technicians would perform the repair, this
    would be acceptable and should not be rejected. This exception would not preclude the
    rejection of exhaust systems repaired in a manner that is not designed or approved by
    the manufacturer and not performed by trained persons.
  • 3. Tailpipe opening is mashed or pinched.
  • 4. Brackets are loose, broken, or missing.
  • 5. The exhaust system fails to discharge the exhaust to the rear or sides of that part of a
    property-carrying-vehicle that is designed for and normally used for the driver and
    passengers and to the rear or sides of the passenger and trunk compartment of
    passenger vehicles.

D. Trailers and semitrailer venting. Inspection of trailers and semitrailers will include a visual
inspection of the venting of cooking or heating appliances to the outside of the trailer or
semitrailer to determine if the heating and cooking appliances are adequately vented to the
outside to prevent the asphyxiation of occupants of any trailer or semitrailer by the operation of
the heating or cooking appliances.

  • 1. Reject the trailer or semitrailer if not equipped with a vent or venting system to the
  • 2. Reject the trailer or semitrailer if there is any complete or partial obstruction of the
    vent or venting system.