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Chevy impala 2002?if it did not go off when you filled it like it was supposed to do then low coolant sensor may be badChevy impala 2002?the coolant light should go off when you fill it up...make sure the connector going into the reservoir is plugged in and secure.for the light....turn the key to accessory mode..push the gas pedal down three times within 5 seconds...it should blink...then turn off.Chevy impala 2002?You reset the change oil light by pressing the gas pedal to the floor 3 times in 5 sec with the key in the run position. The light will flash and go out. The low coolant sensor is in the right tank on the radiator and most likely need to be removed and cleaned as sludge builds up on it causing the light to stay on.