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To reset the check engine light you must have an OBDII code reader with the reset function. The underlying fault that caused the light to turn on must be fixed or the light will turn on again once the condition is detected.

The light will be reset if the battery is disconnected for about 10 minutes but will turn on again if the fault that caused the light to turn on is not fixed. Also, the engine will not run at its best until the computer is retrained.

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