The light just came on for the first time today. Just the light that is shaped like an engine. How do I interpret and repair these issues? I have an Innova 3030 code reader that does powertrain, chassis and body codes. The 5 minute average instantaneous mpg seemed a little low on a familiar road course, maybe 39 versus 42. No other symptoms while driving for an hour today with the engine light on. I have not tried to erase the codes yet. Does anyone have any familiarity with these codes on this vehicle?