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Option 1 is to remove the negative battery cable for 5 minutes to turn the light off till the computer sees the fault again and turns it right back on.
Option 2 you can go to a shop or dealer or parts store and get the trouble codes pulled via scan tool and diagnose the codes and fix the concern.
Option 3 you can leave it and possibly cause more damage and more expensive repairs for example if its a air /fuel mixture code you can flood the converters with fuel and clog them up resulting a 1800$ repair when a possible vacuum hose costing 18$ could of been replaced.