Illinois Emissions

In the state of Illinois, a vehicle emissions test will be required every other year for many original registrations. They are also required for annual registration renewals as well. You will receive a renewal notice annually and it will indicate whether your vehicle is required to have an emissions test and when you should have it completed by.

Vehicles that require an emissions test:

  • A vehicle that is newer than 1996 and is more than four years old
  • A vehicle that runs on gas and is considered a passenger vehicle
  • A vehicle that is a light or heavy duty truck or bus


Emissions tests are valid for two years and they are required in order to reinstate a registration that has been suspended as well as for the completion of an original vehicle registration or a renewal. Car dealers who are selling a used car are required to provide a valid emissions test for the buyer of any vehicle that they are selling, but it is up to the buyer to obtain one when making a purchase from a private individual.


There are some exemptions when it comes to emissions testing. For example, you will not be required to have an emissions test if:

  • Your vehicle is a motorcycle, a motor driven cycle or a motorized pedal cycle
  • If it is an antique vehicle, or a custom vehicle, street rod or older than 1967
  • The vehicle is powered by diesel
  • It is intended to be used in parades or other ceremonies
  • It is used as farm equipment or on the farm
  • It is registered in a different state and has already underwent an emission check
  • It is used for either amateur or professional sports
  • It has had a junking certificate issued

Testing Locations and Fees

There is a $20 annual fee for a voluntary emissions test, which can be completed by an authorized emission Inspection Station that has been licensed by the state. You should be able to see a sign at the station as well as a maximum fee display. There are only a few stations that provide services to light duty diesel vehicles.


You will need to have your vehicle repaired if it fails the emissions test. It will then need to undergo the test once again after the repairs have been completed. It is important that a Recognized repair Technician makes the repairs so that the proper standards can be followed.

If repairs have been made and your vehicle still fails the emissions test, it is possible to apply for a waiver. In order to apply for the waiver your vehicle must have already received the maximum amount of repairs that is allowed under the emission performance warranty.


There are certain areas in the state of Illinois that require emissions testing and you will need to check with your particular county to see if you live in an area that requires the testing to be completed. It is important that you maintain a healthy vehicle in order to protect the environment and to comply with the state laws that have been put in place.