*17M ... yes, the big red icon came up ... but before that, i already noticed something must have struck my tire due to its noise, travelled some distance till i can safely check the tire
i did not find the nail at that time (even if i find it, there is not much i can do) and it didn't look flat ... when i drove again, after some 300 meters, the icon showed up with corresponding audible alarm ... i stopped again to confirm the flat, knowing that the RFT can take the beat, i just drove home slower than usual
in your case, the puncture was a slow leak ... 5 psi difference is not enough to trigger the alarm ... given more time for pressure to drop, the alarm would have shown, at which time you are already running flat
the sensor is not pressure based ... it is rotation based ... with an RFT, it takes substantial pressure drop for the difference-in-rotation to be detected
