No bluetooth-connection to my car since update

Until the penultimate update (18…Android 7) the handsfree in my car (Opel Ampera 2012) worked fine. Since then not any more, a pairing is no longer possible. When entering the security number I get the error message “wrong PIN”, but it is correct. The car recognizes the fairphone 2, but cannot connect to it.
Does anyone know the problem and ideally how to solve it?
Thank you very much for your help!

Remove the car from your saved Bluetooth devices (this can be done via the gear wheel next to the entry) and re-pair it again.

Thanks! I did, but the problem remains.

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