Malfunction Indicator Lamp refers to any light that indicates a malfunction with a system like ABS light, Check Engine Light, Airbag light

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Why would a new gas cap cause the “check engine” light to shut off?

This happened to a friend of mine: The "check engine" light came on in his truck (Toyota). He replaced the gas cap and the light shut off. Then I also had a "check engine" light come on in my 1994 ...