Thank you for commenting about the clean air reference. I finally saw a diagram of one on google images: http://images.google.com/
You enter the name of something and get tons of pictures to follow.
I have used that site frequently to view lots of hardware which others describe in words. The one photo showed a port around the wire leads which matches what you said about air entering the sensor around the leads.
Apparently, my messing with the unit on the Ciera did not disturb anything right next to the sensor where the leads enter the unit.