My 2001 Nissan Altima runs fine except one minor problem: its “service engine soon” light will be ON and OFF randomly. Usually it will be ON for 2 weeks, after I fill the gas, it will be OFF for a while. This is OK except here in St. Louis all the cars need to pass the emission test, and from my experience this light will cause problem to pass the test.
So what did I do? This afternoon as soon as I saw the “light” is off (I put in gas in the morning), I drove to the test station. I was nervous initially because the tester made me turned off engine in the station. Lucky when it restarts the light stayed OFF and my car passed the test. I know two years later I may have the same worry, but right now I am a happy camper 🙂