Two months ago a steady yellow engine light came on in my car. I went to Advance auto parts store and got it tested for free. The reader on the tester said it could be anything but nothing bad. After that I drove the car and the engine light came off automatically and has been off. This morning I turn my car on and the steady engine light comes on again. What does this mean? My car runs great. I had a state inspection on my car in February 2009 and my car passed. What could it be? Nothing? Ect
