I passed the test in spite of a fault code for the Oxygen Sensor. Go figure.
The Cat was pretty hot in that I drove for about 20 minutes before the test.
Perhaps a failing 02 sensor might have caused the high HC level?
I've changed the plugs about 3000 miles ago and the old ones were perfect -- light brown in color.
Wires were done about two years ago.
I plan on changing the oil this weekend and running a couple of bottles of Techron before the change. The injectors are fairly new but cleaning them can't hurt.