You can purchase a scan tool from your local auto parts store for under $100. This tool will read the codes and erase them. You need to read the codes and make necessary repairs then clear the codes to eliminate the light. Some parts stores will read the codes for you at no cost if you purchase the parts from them to make repairs.
unplug battery for 20 min
You can disconnect 1 battery cable for about a minute to reset it but if you don't fix the problem it will be back on shortly.
reset service engine light
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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unhook the battery for about ten minutes
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Either try disconnecting the battery for about 10 mins. or have vehicle scanned to determine the problem and have codes cleared
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