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To clear the check engine light on your 2005 Chevrolet Impala, you must address and fix any problems identified by the diagnostic codes first. Neglecting to do so will likely cause the light to reappear soon after. Resetting the light simply to hide issues is dishonest, especially if you plan to sell the car. There is no special method to reset the check engine light on the '05 Impala; you'll need an OBD-II scan tool or be patient. With the scan tool, you can clear the codes and the light will turn off by itself. Alternatively, disconnect the negative battery terminal for at least 30 minutes. Reconnect it, start the engine, and the codes should be cleared, leaving the check engine light off.
To clear the check engine light on a 2005 Chevy Impala, you will have to utilize an OBD II scan tool.