Actually Walton, Dalton , whatever makes no difference, as I prefer not to have post directed at me in the subject line.. I read them all and if they are pertinant, they get answered.

Anyway , the sensor is in the exhaust pipe before the cat..
There are pages upon pages on test procedure in the archieves to help one check it out.
Try the test run in the meantime .. I would clear the codes one more time ........