If you buy cheap Bluetooth OBD-II dongles, you'll find they all have the same addresses. That's why you can't buy two dongles and use them in two cars without r

If you buy cheap Bluetooth OBD-II dongles, you'll find they all have the same addresses. That's why you can't buy two dongles and use them in two cars without re-associating each time, for instance. If you buy the $150 dongles, they have valid addresses like you would expect.