Answer: A black box does not normally measure tyre pressure directly, but incorrect pressure can change how the car steers, brakes and uses energy.
The black box cannot replace a pressure gauge
Most systems are not measuring tyre pressure directly. Use the vehicle manufacturer’s recommended figures and adjust them when carrying heavy loads if instructed. If the car has a tyre-pressure monitoring system, investigate warnings rather than assuming good insurance scores mean the tyres are fine.
Pressure changes how the car responds
Under-inflated tyres can make steering feel less precise, increase rolling resistance and generate more heat. That can alter braking and cornering behaviour enough to influence the movements a telematics system records.
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