How to reset "service engine soon light"

you can use a scan tool to reset the light , or just drive the car , when the computer see's that it is fixed it will turn the light off by itself

The On Board Computer tests the Evaporative Emission system once certain criteria and drive cycles are met. Once the computer tests the system and no longer sees a problem or fault it will turn out the Check Engine Light itself as it no longer sees the fault but it may take a week or several weeks to do a self check and reset but it will turn itself off.