i dunno man, when i had this CEL problem, almost bought an accord o2 sensor, off a different year car, like 5th generation, i have a 6th. and people told me not to even do that, so i dont kno if having a civic o2 sensor is such a good idea, even tho, their both 4 wires. so i ended getting the one made for me, and worked fine, but than again, ur problem could be a coupe of things.