Q: Since ios8 upgrade my iPhone 5 is unable to Bluetooth with my car

Hello Claggles,

Sorry to hear about your Bluetooth pairing issues with your car. Check out the First article below to troubleshoot the issue further. It will have you go to iCloud.com and look for any devices that you are not using and remove them from Find My iPhone. I have also provided other troubleshooting articles that you may have already done but added them to have something to check against your troubleshooting. 

Get help connecting your iPhone or iPad to a Bluetooth accessory

http://support.apple.com/kb/HT6473

iOS: Troubleshooting car stereo connections

http://support.apple.com/kb/ts3581

iOS: Troubleshooting Bluetooth connections

http://support.apple.com/kb/TS4562  

Regards,

-Norm G.