This is a RAM allocation error in Android 14. Open Developer Options > Background process limit → Set to "At most 2 processes." This prevents the X431 emulator from being garbage-collected.
: Android 14 (and the hardware in newer phones like the Pixel 8) began dropping support for 32-bit apps . Since the majority of original Launch X431 diagnostic "marks" (the vehicle-specific software modules) were built as 32-bit binaries, they simply would not install or launch on Android 14 devices. xdiag x431 diagzone android 14 mhh auto page 1 fixed