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Important Information

Effective July 1, 2014

The Vehicle Emission Testing Fee is $9.00 in Hamilton, Rutherford, Sumner, Williamson and Wilson Counties.

Davidson County

If you have a vehicle registered in Davidson County, go to Metro Public Health Department of Nashville/Davidson County, Vehicle Inspection.

Hamilton, Rutherford, Sumner, Williamson and Wilson Counties

If you have a vehicle registered in Hamilton, Rutherford, Sumner, Williamson, or Wilson County, see testing information and station schedules.


The State of Tennessee developed more restrictive regulations to control air pollution from mobile sources in counties that were not meeting the new 8-hour ozone Federal Standards for air quality. As a result, certain vehicles registered in Hamilton, Davidson, Rutherford, Sumner, Williamson and Wilson counties are required to pass a vehicle emission test. Gasoline and diesel vehicles with a model year of 1975 and newer and a Gross Vehicle Weight Rate (GVWR) of 10,500 lbs or less must pass an emission test before the vehicle’s registration can be renewed. Motorcycles are exempt.

Inspection programs such as the one implemented in Tennessee have proven to be very beneficial in reducing harmful ozone air pollution. Emissions from an individual car are generally low, relative to the smokestack image many associate with air pollution. But in numerous cities across the country, the personal automobile is the single greatest polluter, as emissions from millions of vehicles on the road add up. Driving a private car is probably a typical citizen’s most "polluting" daily activity. Ozone levels in many cities have been reduced with the introduction of lower volatility gasoline, and as newer cars with improved emission control systems replaced older models. There has been significant progress in reducing vehicle emissions, but the number of cars on the road and the miles they travel make mobile sources an ongoing problem. Unless we dramatically reduce the amount of pollution vehicles emit in actual use, or drastically cut back on the amount we drive, smog-free air may become a problem for many of our cities. Our Thanks to those driving clean vehicles, and helping us keep our air clean for this and future generations.

Some Important Facts

  • For an On-Board Diagnostics (OBD) test:If your battery has recently been disconnected or serviced, your vehicle’s OBD system may not be ready for an OBD emissions test. This means you will have to drive your vehicle until codes have had a chance to reset. Check your owner’s manual or call (615) 532-8378, or toll free 1-866-329-9632 for more information.

Guide to resetting your drive cycle. 

  • Due to safety considerations your vehicle may not be tested if:
    • It has fuel, oil or coolant leaks 
    • It has visible smoke 
    • It has excessive exhaust leaks 
    • The idle is not set to factory specifications 
    • The inspector would have to reach more than an elbow length under the vehicle to insert the sampling probe. 
  • Your vehicle will undergo a 2 point tampering check prior to the emissions test. The emission control devices subject to inspection are:
    • A catalytic converter (Only if your vehicle was manufactured with a catalytic converter) 
    • A fuel gas cap 
  • If you fail the emissions test, the Department has an ASE certified mechanic on staff to assist you. The mechanic
    provides free diagnostic information and can help determine why the vehicle is not passing. You may also be eligible to receive one of two types of waivers, Cost waiver or Hardship waiver, for your failing vehicle. For more information, please call (615) 532-8378 or toll-free (866) 329-9632.
  • You can have your vehicle tested at any station regardless of where the vehicle is registered.
  • The last week in the month is the busiest. Emission tests are good for 90 days, so come early and save yourself some time.
    • Tuesdays and Wednesdays continue to be unusually high volume inspection days compared to the rest of the week.
    • Thursday or Friday afternoon, and Saturday’s are the best times to visit a station, unless it happens to be the end of the month.
  • The overall average waiting time at stations is approximately 5 minutes.
  • The cost of an inspection is only $9.00. No checks or bills over $20.00 accepted