I guess I'll add my 2 cents here. Haven't been here in awhile.

The O2 sim does fix this on 01+ cars, the pcm is only looking for normal switching from the sensor. You can also just run the sensor and eliminate the mil in the pcm. I've got numerous cars running like this here in the twin cities.

Another option in simply running 00 code in a 01/02 car. This seems to only work on GP's though. The bcm's in regals/impalas/montes/bonnies don't like when you swap pcm code to diff years, even with security parameters modified. You can however swap to a 2000 bcm in your car and rock the 00 pcm code, done this on a few car's too.

you 03+ guys can't do this due to issues in the trans/ different pcm for 04+ guys.

If anyone has anymore questions I'll gladly try and answer.

-Chris