What are the MO emissions or smog check requirements for vehicle registration? Missouri

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Prior to completing the car registration process at a Missouri (MO) Department of Revenue (DOR) service center, each auto is required to pass an emissions or smog inspection. Autos older than five years are also required to pass a safety inspection.

Emissions Tests Requirements to Register a Motor Vehicle in Missouri

If you live in the city of St. Louis or in Franklin, Jefferson, St. Louis, or St. Charles counties your auto must also pass a smog check and emissions testing. Areas covered on the tests include:

  • Catalytic converter
  • Crankcase breather
  • Fuel filters (You should consider replacing your filters prior to the inspection.)
  • Air pump (An agent at the inspection station will check the belt tension.)
  • Fuel cap (This is checked for cracks or leaks.)
Get a copy of the vehicle inspection report before you leave the inspection station. Present this report to the DOR clerk when you finalize the register car steps for your motor vehicle. Have your motor vehicle’s emissions tested within 60 days of registering the auto.

Vehicle registration can be completed on motorcycles and autos that were manufactured in 1995 or earlier absent the emissions and smog test.

If you drive your auto less than 12,000 miles every two years, you can complete a Mileage Based Exemption Request to see if the DOR will exempt your auto from the emissions and smog tests.

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