On Android 7.1.1, the Nexus 6P and 5X have an in-car Bluetooth issue unresolved since October

As mentioned in the lengthy discussions found at the Google Product Forums and the Android Issue Tracker website (see the source links below), the issue has been around since late October, when Google released the first 7.1.1 Nougat developer preview. Users were hoping that the problem would be fixed with the arrival of the January security update, but that wasn't the case.
sources: Android Issue Tracker, Google Product Forums
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