For the first 12 years that I owned my Corolla, I never had Check Engine Light problems. Now I have the same problem intermittently. The Code is always the same and points to a problem in the emissions system. We replaced the gas cap and occasionally, I still have a problem. The light had not come on for many months. Then 2 weeks ago, it was glaring at me. My husband retightened the gas cap and the light went out about 50 miles later. I find this situation quite annoying. Since it has continued intermittently even with a new gas cap, I can't help but wonder if the problem lies elsewhere.