It is different for different makes and models of cars. You need to post the year make and model of your car or truck
If it is the check engine light. You need either a code reader or scanner to do it. If it is just the sevice light, then turn the key on (don't start) press the fuel/gas pedal three times slowly with in five seconds. the light will flash. When it stops, turn it off. It's reset.
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