Question about Ottocast Wireless Carplay&Android CP88-T2 Mini

Which device do I need for mirror screening if my car already has wireless carplay

The product only works with vehicles that support wired Apple CarPlay from the factory. If your vehicle already has wireless Apple CarPlay, the adapter is not designed to extend or replace this function. Target Screen Mirroring is not explicitly supported with this add-on module, as it primarily enables wireless CarPlay and Android Auto for wired systems. It therefore serves as a wireless adapter for wired CarPlay systems, not as a supplement for existing wireless CarPlay.