Which M.I.L conditions will result in a failed emissions test?

The scenario where the Malfunction Indicator Lamp (MIL) conditions result in a failed emissions test is accurately described in the first choice. Specifically, if the MIL illuminates when the Key On Engine Running (KOER) test is conducted or if it fails to illuminate during the Key On Engine Off (KOEO) test, it indicates a malfunction that needs attention.

In the KOEO test, the MIL should light up briefly to confirm that the bulb is functioning; if it does not, it suggests an issue with the light itself or the vehicle's electronic systems. And during the KOER test, the MIL should turn off, indicating the engine control system is operating correctly. Thus, failure to meet these conditions signifies potential problems that could lead to emissions not being properly controlled, resulting in a failed emissions test.

Other options describe scenarios that either do not indicate malfunction or are not relevant to the criteria for passing or failing an emissions test. For example, if the MIL remains off throughout the test, that generally signifies that no issues are detected, which would not lead to a failure. A blinking MIL typically indicates a serious issue but may not pertain directly to emissions testing criteria as outlined. Additionally, the age of the vehicle itself being over 10