Transmitte data from obd2 to rp4 via arduino

i have successfully installed a Linux version on rp4 , now i need some help to connect rp4 to obd2 via Arduino .

Linux version supports the OBD2 adapters same as other versions, so Arduino is not requred to connect to your vehicle.

does it support obd2 usb adapter s?

Yes, USB connections are supported in Linux version.