Don't Look Back

Hey guys, I already did a search and I found out what some of the problems could be, but I still have a question. When I was driving home last night, my SES light came and and kept flashing for about 20 minutes, then it stopped. I got home and checked all the fuses and they were fine. I started the car, and she fired right up. Today I took her out for a ride and the light never came on. Is there a problem here or what? I'm planning on taking it to the shop just to play it safe. What do you guys think?

Thanks,
Keith