Originally Posted by thermal

Once you go OBD1, you will not have to worry about the secondary O2 CEL anymore. The o2 spacer/non-fouler is a hit/miss deal. The easiest way to get rid of that secondary O2 CEL, while you're still on OBD2, is to pull the sensor off the exhaust path. So, just take it out and leave it hanging securely in the open atmosphere. Do not disconnect the sensor or the CEL will come back. Lastly, do not forget to place a plug on where the sensor came from.