AS OF JANUARY 2015: vehicles in this age range with their “Check Engine” light turned on will fail the inspection. They must be repaired and reinspected in order to pass.
AS OF JANUARY 2015: Hybrid and plug-in hybrid vehicles that are 8 years and older must have a test of their OBD computer systems. If these vehicles have their “Check Engine” light turned on, they will fail the inspection and must be repaired and reinspected in order to pass.
Fully electric-powered vehicles (i.e., with no gas tank or tailpipe emissions) remain exempt from inspection.
Vehicles that are 12 years and older will have their emissions tested on a dynamometer (a treadmill-like device that provides real-time emissions data). Hybrid vehicles aren't placed on the dynamometer.
A two-speed idle test is required every year for 1981 and older light-duty vehicles and all heavy trucks. This test can be done at Air Care Colorado inspection stations or independent licensed test stations.
Enhanced inspection expanded to north Front Range
The Enhanced Vehicle Emissions inspection was expanded in 2010 to parts of Larimer and Weld counties to control ground-level ozone.