The light turned on in October 2010 so I took the car to Toyota who said it's an issue with the Catalytic converter. I was gonna take it to a couple of places to get some quotes, however the light turned itself off in December 2010. I heard that the computer will reset itself from time to time and if there is no further issue then the light will turn itself off. The bulb itself works fine (it still turns on and then off at start up) and I don't have to worry about e-check or anything like that . Should I just let it go as a fluke or should I take it back to get it rechecked? Thanks