Well, I have read through everything and attempted to do the zero point calibration, but can not get it to work. I read some info. that seemed to suggest that it needed to be in pin 12 and 4 on the newer models (mine is a 2008), instead of 14 and 4. I tried both, and can't get even the initial step to work.

The lights came on a few days ago, and remained on, even after turning the car off and restarting it again. After it sat over night, they have not come on again, after several short drives, including a two half hour trips yesterday.

I disconnected the battery today for an hour or so, and will see what happens next. If they come back on, I guess I will replace the gas cap first, then move on to the brake pedal sensor, since I cant get the ZPC to work.