Super rewarding to have my Suby after salivating over them all these years. Shortly after buying my 02' WRX a few months ago, my check engine light went on, there is nothing unusual coming out of the exhaust. This happened after I swapped the aftermarket with the stock to pass smog. I have unplugged the battery and reset the ecu and after a week it came back on. Does anyone have this problem or know how to handle it?