This happens much more often than you think. Therefore, if none of the above reasons helps, you just need to buy a new adapter.

In addition to the permissions described in issue #7, there is another permission to access Bluetooth, which is not displayed anywhere and is automatically given to the program by the operating system at the time of installation. But sometimes, the Android OS doesn’t. Just a system glitch during the installation of the program and as

If Bluetooth is turned off on your phone, you need to turn it on.If your adapter has a power button, then you need to press it to turn it on.

Allow the app to access Bluetooth.Android 6.0-11 (and some 12): Android Settings -> Applications -> Car Scanner -> Permissions -> “Location/Geolocation” but it’s true).Android 12 and above: Android Settings -> Applications -> Car Scanner -> Permissions -> Nearby DevicesiOS: iOS Settings -> Privacy & Security -> Bluetooth -> enable Car Scanner there

Turn Bluetooth off and on. If it doesn’t help, restart your phone.

Remove the adapter from the socket and insert it again. If the adapter has a power button, make sure the adapter is turned on, otherwise press the button.

Disconnect and force quit another program. Sometimes this is not exactly a trivial task.On iOS, you need to trigger a task switch and force close all other OBDII apps.On Android this may not work. the program may leave behind a background service connected to the adapter, so it is better to use the shutdown methods

Most Android adapters work via “classic” Bluetooth, but sometimes there are adapters that work via Bluetooth LE (4.0).IMPORTANT! Bluetooth LE is different from classic Bluetooth. These are fundamentally different ways of wireless communication.If your adapter only supports classic Bluetooth, you must select the Bluetooth communication method.If your adapter only supports Bluetooth LE (Kiwi 3, OBDLink

Adapters can have the same name (usually OBDII) but a different address. The connection is made not by the name of the adapter, but by its address. Therefore, if you have not selected the adapter that is connected to the car’s connector, the program will not be able to connect to it.Solution: Go to Settings