[hawk2100n]

Looks like you solved your problem with the O2 sensors however if you continue to run into problems, do a search for the spark plug non fouler - O2 sensor trick. Very simple to do. They add a some standoff to the oxygen sensor by pulling it out of the exhaust flow and make the car think the cat is working. My car had the cat removed by a previous owner and that was able to get the CEL to stay off for 40k miles.