Thanks to all for the replies, very helpful. I replaced the O2 sensor behind the cat and fired it up. Check engine light was still on. Needless to say I was quite frustrated. Ultimately I got it sorted out but thought, in case someone in a similar situation reads this, I would pass along my experience. So, I figured it did not fix my problem but thought I would take a chance that it had to be driven some and brought up to temperature. After a 15 minute drive light still on. Stopped and restarted. Light still on. Then I wondered if maybe it need to be reset. Read about that and saw a few descriptions. One was that it would reset itself after a number of starts but no specific number stated (did not sound likely to me - that should have clued me in .. lol). Another was to disconnect battery for 30 minutes or so and that would reset. And the to take it to someone with a reader and have it reset. My guess was that it would reset itself immediately and hence I had not fixed it. Well, I was wrong, I went to disconnect the battery and decided to start it one last time first and the light was OFF! RIGHT ON! This was after about 5 starts and it seemed to reset itself. And I am glad. Thanks to all the responded, it was a lot of help. Have a great day!