This "black box" they talk about is nothing more than your airbag module. Your airbag module retains memory in the event of a crash involving airbag deployment. Things such as speed and if your seat belt attached or not are the main things they can use from this. It is nothing that needs calibration since it is just receiving this info from the other onboard computers. The speed would also be very accurate, unless of course you have some tires of a very differnt size on and didn't have the computer calibrated for it. But that would be very easy to show if you were in a wreck, and they were claiming a different speed than you felt you were going.
Just don't drive like an ******* and you won't ever have to worry about this.
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