April 2020-manufactured Octavia Scout 2.0TDI (MkIII facelift).

I was driving back from France to Spain the other day, after the car had been parked for a week, and shortly into the drive, I got a TPMS warning. Eyeballing it, the tire wasn't obviously very low, and I was in a hurry, so I went to reset the TPMS, with the intention that if it signaled Again then I would recognize that there really was a problem.

Each time I tried to reset the TPMS (Cat, Settings, Tyres, Set) it would give the error that it could not "store". It still did this after rebooting the head unit (long-press the power button on the display). I don't recall whether I fully turned off the car and tried again.

Once I got home, I manually checked the tire pressures, and indeed that wheel was a few PSI low; I pumped it up, turned on the car (without even starting the engine), and lo and behold I COULD now Set the TPMS. Without ever having rolled the car.

Nothing critical, but I thought that the TPMS worked only by RPMs, so actually changing the pressure in a tire shouldn't be detectable until the car rolls again, and both this time (in the end) and previous times when I've adjusted tire pressure at reset the TPMS / Set "all tires are at the correct pressure" (or whatever the precise text is), it accepted the TPMS reset withOUT having moved the car.

So, any idea why TPMS Set would fail to "store"? Nothing critical, but it would be interesting to understand.

thanks!

As far as I am aware you can't set TPMS while the engine is running.

This should ensure that you have stopped the car and checked the pressures.