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Why do we have emissions testing?

Federal law requires Vermont to have an emissions testing program. Ensuring your vehicle is in proper working order allows for;

  • Early detection of defects that lead to repairs that improve vehicle performance and fuel economy.
  • Repairing a defect before it gets worse saves money.
  • Protecting our environment and our health by identifying vehicle problems that cause increased air pollution.

What are some possible reasons for failing the OBD check on a vehicle inspection?

  1. The vehicle’s OBD system connector has been removed or is otherwise not working properly. The OBD check cannot be completed if the connector is missing or is not working properly. 
  2. The Malfunction Indicator Light does not illuminate when the ignition key is turned to the “on” position. When the vehicle’s OBD system detects a problem, it turns on the warning light to alert the driver of a problem. However, if the light cannot illuminate because the bulb has burned out or is otherwise not working, the driver would not be alerted to the problem. 
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