Recently I installed a bosal down pipe, and reset the ecu. After two days I got a cel. I have not installed a fix yet. I had the cel for a week or so. One morning I started car, and no cel and no cel sence. Is this normal? I still plan on installing the fix. I plan on using spark plug non fouler fix. Will the ecu clear a cel without a reset? Does it reset its self? Any insight would be great.