Car: 2015 Chevy Malibu, 50k miles;
Error Code:P2097 Post catalyst fuel trim system too rich bank 1;
How it happened: I refueled the car last night with almost empty tank and drove home, on the way home I noticed the check engine light. Car still drives normal.
Additional information: There was a pretty big T storm the day before yesterday.
Questions: Could it be bad fuel? Before going to the dealer, what simple stuff can I try?