hey guys
my 98 accord check engine light on the other day. i took it to autozone get the trouble, which is p0420---the catalyst system efficithcy for bank 1 is below threshold for the current engine operating condition.
what does this mean? what should i do to get rid of the check light? i try to reset the ecu. it will go off for one day, then second day come back on again. does that mean it's time to change oil? this really bothers me, so give me some ideas, thanks.