If you have confidence with your mechanic and the car runs fine, drive it until you have a problem. The Check Engine light can be on for a very long time if nothing else is wrong. The only way to correctly turn off the engine light is to correct the fault then reset the light. If you just reset the light and fault still exist, the light will come right back on. To reset the light you disconnect the battery for about 5 minutes. The other option is to have the fault fixed if you feel it is necessary.
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Gaker
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