just a tip guys, O2 sensors never die, they get murdered. O2 sensor only got bad if there is a short in it. other than that all you have to do is put the O2 sensor under a torch(blue flame) and heat it till its cherry red, make sur you hold it with a visegrip or something of the like this process burns off all the carbon clutter on the O2 sensor that was causing it to send out signals that it was rich cause it cant read the pressure properly. but if its a short in the sensor, replace it of course.