Today’s vehicles are manufactured with a Check Engine Light. When DEQ’s onboard diagnostic test recognizes that this malfunction indicator is commanded on, the vehicle will fail the test. However, as intended, some motorists respond to their Check Engine Light by seeking repairs earlier than waiting for DEQ’s two-year periodic inspection. Such early action prevents excess air pollution and, along with cars now being manufactured much cleaner, is why the vehicle failure rates of VIP programs across the country are so low for the newer model years. The auto manufacturers, the Federal Test Procedure certification emissions test, DEQ’s onboard diagnostic test, the preventative nature of the Check Engine Light, the motoring public and local auto repair facilities all work together to properly maintain cars and reduce air pollution.