You repair the cause of the code, then reset the code with a scan tool or by unhooking the battery.
reset service engine light
Have the engine controller checked for faults then serviced and the light turned off. Take it to the dealer.
unhook - side of the battery and let set 5 mins and reconnect and the light will go out.
A reset Engine Service Light comes on when an issue comes up with in the engine. This light can be reset by a tech or by fixing the problem.
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if you disconnect the battery for at least 5 minutes then reconnect it ,it will reset the check engine light
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After reading the code, and repairing the codes, you reset code with a scan tool.