My codes are $7E8 and the $7E9.
Check engine light on for three days
My kia optima has the same problem. The codes mean bad readings from the mass air flow sensor in the air intake. In my car it happened after I filled the gas tank and a tube that runs from the gas tank to the air intake spewed gas on the sensor. There is a valve in this line that is supposed to stop the liquid gas and just let fumes through. That vale failed and caused the sensor to freak out. I had to remove the sensor, clean it, put it back, and only half fill the gas tank from then on.
Where is the sensor