Bluetooth Not Working Correctly After iOS 5.1 Update iPhone 4S

Before updating my iPhone 4S's software to 5.1 the Bluetooth connected to my vehichle's Bluetooth  radio and worked perfectly. Now if I receive or make a call, the Bluetooth connects and rings through, but I can't hear them and they can't hear me. Also, my music will no longer play through the vehicle (which worked perfectly before the update). The song title shows up on the vehicle's radio but no audio. I have tried disconnecting and reconnecting the bluetooth but nothing seems to help.

Anyone else having this problem or know what's going on? I'd really appreciate the help as I use this feature on a daily basis. Thanks in advance for your help.

PS On a side note, this update made an amazing difference on my battery life on my iPhone 4S. I used to charge my phone every night and have about 40% remaining at the end of the day...now it's about 85% left at the end of the day with the same amount of usage!