Poor ground to the D Sensor,Air Bag system
 

The bulb blew on the warning panel for the air bag. The buzzer started beeping (5 times) telling me I had a problem with the light. After a day I finally figured out there wasn’t a bulb anywhere with that type base and I added a bare bulb to the old base and that worked fine. Now am I getting 8 flashes of the light that indicates I have a poor ground to the D Sensor?
Does poor ground mean that I have a ground but not a good one? Has anyone had any experience with this? If the sensor is bad can it be rebuilt? If I need a new one where would I buy one? I assume that I have a poor ground to only one since there is another code for poor ground to all sensors.