What are the TN emissions or smog check requirements for vehicle registration? Tennessee

Emissions testing is mandatory in Tennessee, but only for residents in the following counties: Davidson (Nashville area), Hamilton, Rutherford, Shelby (Memphis area), Sumner, Williamson, and Wilson.

Pass a Smog Inspection to Register Car in TN

If you reside in one of the above listed counties, the DOR requires emissions testing for most gas and diesel vehicles with a model year of 1975 and newer and a gross vehicle weight rate (GVWR) of 10,500 or fewer pounds. Motorcycles and new model cars being registered for the first time are exempt from all smog check requirements.

Proof of emissions testing is required for vehicle registration and registration renewal. To aid the process, the DOR allows you to test up to 90 days in advance of your registration's expiration date. Consider testing early. All emissions inspection sites experience heavy end-of-the-month rushes.

If you pass, you can then apply for car registration with your County Clerk. If you fail, you must have your vehicle repaired and retested.

For questions, call one of the following numbers:

  • Davidson County (Nashville area): (866) 623-8378
  • Shelby County (Memphis area): (901) 528-2904
  • Hamilton, Rutherford, Sumner, Williamson, Wilson Counties: (866) 329-9632

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