Thanks Geoff. I have done some searches and found that:

1. Code PO141 is the passenger side rear O2 sensor, which may or may not actually be defective. It does not affect performance, and really isn't a big deal short term.

2. It might just be, as yours is, a glitch that cannot be determined. It runs very well as it always has. Gas mileage is fine, it runs cool, shifts and idles great, etc, etc.

3. It is no longer an "intermittent" problem. It's been on for a week. It was recommended that I use some octane booster and also possibly a bit if fuel injector cleaner and see if it might have been a bad batch of gas.

We will see, but anyway, at least it isn't stalling or running poorly. I would bet it's that O2 sensor.

Chris