It doesn't actually require the ABS (anti-lock braking system), but uses the ABS wheel speed sensors to count wheel rotations, so it's essentially a free way to

It doesn't actually require the ABS (anti-lock braking system), but uses the ABS wheel speed sensors to count wheel rotations, so it's essentially a free way to add TPMS, no additional hardware required since ABS is already required, just need software to track wheel rotations. https://en.wikipedia.org/wiki/Tire-pressure_monitoring_system#Indirect_TPMS https://en.wikipedia.org/wiki/Tire-pressure_monitoring_syste...