See also:

Fog Lights
When the low beam headlights are on, turn the fog light switch on to use the fog lights. Fog Lights When the fog lights are on, the indicator in the instrument panel will be on. ...

Emissions Testing
Testing of Readiness Codes Your vehicle uses “readiness codes,” as part of its onboard self diagnostic system. Some states refer to these codes during testing to see if your vehicle’s em ...

If the Malfunction Indicator Lamp Comes On or Blinks
Reasons for indicator lamp to come on or blink  - Comes on when there is a problem with the engine emissions control system, or the fuel fill cap is missing, or loose.  - Blinks when en ...