Reading A Failed Denver Emissions Test

In order to make sure that everything is in perfect order with your car, it is important to know how to read a failed emissions test.

In case of failure, you will receive from the technician a vehicle inspection report, abbreviated VIR, that will show which of the three 3 possible gases is out of the standards: hydrocarbons (HC), carbon monoxide (CO), nitrous oxide (NO).

At the very end of this report, there is a section ASM Emission Test Resume indicating the results of the test – the outcome for each substance.

  • The value under MAX shows the maximum allowed for that specific gas, as indicated by regulations;
  • The result under AVE is the average emissions of the same car type (same year, model etc);
  • MEAS is the actual emissions value of your vehicle.

In addition to the three gases mentioned above, carbon dioxide (CO2) and oxygen (O2) levels are also measured, in order to make sure that there are no other issues with the vehicle, but do not impact the failure or passing of the test.

If reading this report seems difficult, there are a few websites online that can assist you in reading and interpreting your failed emissions test Denver results.