i had been using a cheap Chinese-made wi-fi adapter, an ELM-327. It worked fine with DashCommand for iPhone, but not so well with the Dash app. I removed the adapter after my car's battery ran down once, which may have been due to the drain from the wi-fi adapter. I recently purchased an Automatic Bluetooth adapter (2nd generation). That's when I discovered that the OBD-2 port was not getting power, as the Automatic adapter was not getting power to make a Blue tooth connection. I tried the ELM-327 again, and it was not getting power, either.