Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Average mileage: 107,163 (60,000–150,000)
17 people reported this problem
I had the check engine light on in my car, so I took it in to get a diagnostic. The mechanic explained that the car is designed to recycle gas vapors, and if some of those vapors escape through the gas cap, then the car detects that as a leak, and the check engine light goes on. He put a new gas cap on the car and the light's been gone since.