Front Air Bag Sensor Control problems of the 2010 Cadillac CTS

Passenger airbag sensor light remains lit at all times. Light is supposed to go off after system check. Manual says sensors needs to be serviced or injury may occur during accident due to airbag failure. According to internet Cadillac forums, many drivers are experiencing this same problem and dealers are telling them "it is normal" or charging over $600 to replace sensor that may or may not fix problem. This is very similar to the recall for 2003-2008 Cts's for the same problem. Even older Cts's are experiencing a return of the problem and dealers won't fix them saying the problem was already fixed in the recall. How can gm say a recall was successful when it didn't fix the problem in the cars identified and newer cars are having the same problems. ?.