[enslow]

In my experience with these kind of sensors, it's not necessarily the sensor itself. I'd try cleaning the sensor itself, and clean all electrical connectors and grounds. There is probably a voltage or resistance profile for the sensor itself so that you can verify that the sensor is working properly.

At least, that's the case with my Grand Marquis. I know the Buick will be different, but I wouldn't be surprised that the principle is the same.