Tyre Pressure Warning Issued Today

[RUM4MO]

Okay, so I talk about people needing to check their cars over regularly, but it seems with my wife's August 2015 Polo having TPMS, I have become lazy!
Winter tyres fitted on 1/11/16 and tyre pressures checked/adjusted/corrected and TPMS reset then.
About 60 miles into a journey today I got the "left side front tyre pressure low" warning, so as soon as I could, I left the motorway and found a safe place to stop, got out and checked all tyres visually, they all looked okay, so I completed my journey and then reset the TPMS with the idea that it would warn me again if pressures changed. After repeating the 75 mile journey back home, I left the car for 30 minutes to cool down, then checked all tyre pressures. The fronts had a 0.5PSI difference between them and the rears were identical, so, again being a bit lazy and finding that the pressure were just above the pressures set on 1/11/16 (today's temperature at +8.5C would probably have been slightly higher, just a guess), I reduced the right side front tyre pressure by 0.5PSI - then reset the system.

So, did that 0.5PSI difference cause the TPMS to alarm, or was it just an anomaly in collected data by the system. I had always meant to drop the pressure of one tyre just to see if the TPMS could catch that change, now I wish that I had done some testing on it! I've still got doubts about that system in my Audi S4 as it came without that system enabled and I enabled via VCDS.

[derkie54]

I had the pressure low warning and when I checked the pressures the low tyre was 3psi down compared to the others although I did leave it a few days.
I have reset all tyre pressures and if it happens again I'll check and let you know the figures.