Flex fuel vehicles can develop fuel calibration issues resulting in illumination of the Check Engine Light and/or lack of power. This commonly occurs if only short trips are taken after changing fuel type from E85 to gasoline or gasoline to E85. In most cases, the fuel calibrations can be reset for gasoline using a properly equipped scan tool.
Problems for specific Chevrolet Impala years:
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Newest reported 2013 Chevrolet Impala problems
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.