Why is the obd2 sensor not communicating on a 1999 crysler ciruss

How do you know that something is not communicating with something? Do you have an engine code, or read-out, or something? Or simply, what are the symptoms?

I assume a code alerted you to this problem. If so, it would help us to know what the code was. The trouble may be due to a problem with the wire connections to the sensor or the sensor itself may be faulty. Proper testing would tell the story.