Q: Malfunction Indicator Light on 2002 Dodge Ram 1500

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The Malfunction Indicator Light comes on and remains on while driving.
(2) Answers
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The Check Engine Light /Service Engine Soon light on the instrument panel should illuminate when you turn the ignition key on but go out once the engine has started. If the light comes on and stays on, comes on intermittently as you drive or comes on and blinks rapidly, the on board computer in your car sees a fault with the fuel injection ignition or power train controls that is causing an emissions failure that may or not cause a noticeable driveabilty problem. A scan tool is needed to to plug into a diagnostic socket under the dash board of you vehicle to determine the fault your Dodge is experiencing.
hi. i have a 96 dodge ram 1500. i took it for a smog and every thing passed except it came up with a MIL failed what do i do. thank you