Can I have two Bluetooth connected devices working at the same time?

[AC Question]

I have a Galaxy S6 and a 2006 Mazda 3. I currently use Automatic Labs OBD plug-in which is connected via Bluetooth to my phone. I am looking to purchase a Bluetooth adapter so that I can connect my phone to my car’s sound system. My question is, can I have both Bluetooth connected devices working at the same time?