Why isnt my Samsung Galaxy S4 storing the Bluetooth radio code?

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AC Question

Samsung Galaxy S4 won't store bluetooth radio code

I have recently upgraded to a Galaxy S4 from an S2 and have found that it will not store my car radio's Bluetooth code, requiring me to input it every time it connects and I mean ever time, even if i turn the car to pump gas. My S2 did not do this and neither did the Blackberry before that. I have looked over the phone, setting the Bluetooth time out to never which made no difference. Does anybody know why this is happening?