Is that the only monitor that is incomplete? The monitors run in a sequence and need to pass before the next one runs. If I were in your shoes I'd replace the upstream O2 sensor, they can be slow or biased lean/rich and not set a code and still cause issues. The ECM watches the O2 switching rate and the voltage and compares them. A fresh rear sensor will often flag a lazy old front sensor. Don't be surprised if you get a P0420 (Catalyst Failure) either way. Other than that the basics apply, clean oil, engine getting up to temp, NO exhaust leaks!, functional EGR, Good basic tune, Etc. If you really want to know just Google "OBDII drive cycle" It's not a secret, but it can be a PITA to run without a dyno programmed for it.
Wow, I agree that you might need an upstream O2 sensor too if the code hasn't cleared in 200 miles. It's too bad that those "driving requirements to reset computers" are kept so secret by the OEM's, but 200 miles sounds like a lot. I reset my Mustang's computer driving 10 miles, turn off/on & drive 5 more miles and it's OK (found this out by trial and error).
I don't want to jinx you, but my wife's Sebring had a code that just wouldn't clear and I had to replace the computer. I hope that's not the case for you. I had no choice since I had a deadline to get her license plates renewed with the emission test.
