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Vehicle Emissions Testing in Missouri

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In Missouri, a vehicle emissions test is required for many original registrations, as well as biennially for registration renewal. The Missouri Department of Revenue sends a notice to a vehicle owner reminding them of the need to register the vehicle. If an emissions inspection is required, the notice will indicate that.

Note: All vehicles registered in Missouri, that are five years old or older, have to complete a biennial safety inspection. The safety inspection is done at state licensed facilities only. Safety inspections cost $12 for all vehicles


An emissions inspection is required for registration purposes for a car or truck when:

  1. It is a 1996 model or newer gasoline powered vehicle with a gross vehicle weight rating of 8500 pounds or less;
  2. It is a 1997 model or newer diesel powered vehicle with a gross vehicle weight rating of 8500 pounds or less;
  3. It is registered in St. Louis City, St. Louis County, St. Charles County, Franklin County, or Jefferson County.
  4. There is a title transfer


Odd model year vehicles are required to be emissions inspected in odd calendar years and even model year vehicles are required to be inspected in even calendar years. A valid test is required to complete a used vehicle purchase registration, a currently owned registration renewal and to reinstate a suspended registration. Used car dealers are required to provide the purchaser with a valid emissions inspection for any vehicle they sell, or to inform the purchaser they have 10 days or 1000 miles to emissions test the vehicle and if it fails, return it to them, to allow them to perform the emissions repairs needed (at no charge to the purchaser) to get it to pass or to come to some other mutual agreement. A private seller is required to document to the purchaser the vehicle met emissions inspection compliance just prior to selling the vehicle.


Some vehicles exempt from emissions testing are:

  1. Those not registered in St. Louis City, St. Louis County, St. Charles County, Franklin County, or Jefferson County.
  2. Those which are 1995 models or older running on gas.
  3. Those which are 1996 models or older running on diesel.
  4. Vehicles with a gross vehicle weight rating greater than 8500 pounds.
  5. Vehicles that are two years old and documented to the state as having been driven less than 40,000 miles (see Mileage Based Exemptions);
  6. Vehicles that are 4 years old or older and documented to the state as having been driven less than 12,000 miles between required emissions inspections;
  7. A new vehicle sold with less than 6000 miles on the odometer;
  8. A solar power or an electric vehicle.
  9. A motorcycle or motor-tricycle.
  10. Those solely powered by alternative fuels like hydrogen, CNG, propane, etc [i.e. other than gasoline, diesel, or ethanol (E10 and E85)].
  11. See all categories of emission testing exempt vehicles here.


Gateway Vehicle Inspection Program is a decentralized inspection program. The state licenses shops to perform the emission tests, providing a blue GVIP sign as visual identification. A list of all current GVIP inspection statations may be found here


The enhanced emission testing fee is $24. Emissions inspections performed on-cycle are good for two years for registration purposes. Emissions inspections performed off-cycle (eg. odd model year in even calendar year or vice versa) allow the vehicle to be registered for one year. The time limit for an emissions inspection compliance document to be used for registration purposes after the approval date is 1) 60 days of for current owners of a vehicle; 2) 90 days in the case of a private sale; and 3) 120 days in the case of a dealer sale.


If your vehicle fails the emissions test, it is allowed one free re-inspection within 20 business days which are Monday through Friday excluding holidays, Qualified emissions repairs, based on the diagnostic trouble codes reported on the test, must be made to allow the vehicle to receive a pass, or be eligible for an emissions compliance waiver. The vehicle can be repaired by anyone, however, should an emissions compliance waiver be needed, labor costs are only accepted for qualified repair work performed at a shop employing a Missouri Recognized Repair Technician. The criteria that must be met, and the applications to be submitted, for a waiver to be approved are found here.


  • If your vehicle is out of state in the 60 day period prior to the date its registration is due, you may submit to the Department of Revenue its General Affidavit Form 768 and be allowed to register the vehicle provided you agree to have it inspected within 10 days of it returning to Missouri. If your vehicle is under 5 years old, and the vehicle is in a state that performs OBDII emissions inspections, you have the additional option of submitting your vehicle for emissions inspection in that state and submit the test results to the Missouri Department of Natural Resources. You will need to call 314-416-2115 to make those arrangements.
  • See also Vehicle History Reports.

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