If I were you I would get a aftermarket cat anyway, alot cheaper... If you wanna turn that engine light off all you have to do is press and hold ur mileage reset button that located on ur cluster then start ur accord. Make sure u keep the button held until light goes off. Even if nothing is wrong with ur accord Honda has the computer set so that the Engine comes on so that you can take it in and get it checked. I learned the hard way when my 99 Accord reached about 40k.. I took it in and $165 later the light was off and there was nothing wrong with it.. Dealers Suck!!