I recently installed a new O2 sensor, however the distance between the connector and the sensor is much longer than needed. (about 18 inches). I coiled the wire, tied it off under the car and everything is working fine. Now, of course, second thoughts....should I be worried? Another related question. Is the only difference between the pre and post cat sensors the distance between the connector and the sensor. Its too embarassing of a story, but in addition to having a sensor that is too long, I also have an extra one and thought I could use it for the post cat.