2002 Bonneville MAP sensor
The Good News: My Bonnie recently passsed the 290K milestone.
The Bad News: A few days later, The Service Engine Soon indicator came on for the first time ever. The code was P0108.
The Good News: The car seemed to run fine so I rolled the dice and replaced the MAP sensor and reset the code and it hasn't come back. (Previously, it would come right back)
Possible Bad News???: The inside of MAP Sensor'* mount and also the PCV valve and its o-rings were covered with motor oil. I'm not smart enough to know if it should be that way but I'm guessing "No."