So I accidentally forgot to plug the sensor back in under the passenger seat when I had the carpets out. With that sensor unplugged I started the car and now the SRS Airbag Warning is on the dash.

Does that sensor trigger that Warning? And if so how do I get rid of it? I left the battery unhooked all night and that didn't help. Any suggestions would be huge!

 

Yes, a disconnected sensor will set off the SRS fault code. Its stored in the computer so you need to find a scanner that can view and clear the code. Not all OBD2 scanners can view/clear SRS codes so research if you plan on buying or renting one. I bet a friendly Volvo dealer would clear the code for you if you simply explain you were doing some cleaning and forgot to reconnect the sensor.

 

Very good! Thanks.