how long does it take porsche 981 tpms to learn pressure fillup?

 

Did you mean read the updated pressures? Should be less than a mile, when sensors send the actual pressures to the TPMS module. It typically is like 2 psi less than actual, but you should notice the difference within a mile of rolling the car. Forgot what's the speed sensors start transmitting, but it's low, something like 15 mph or so. If you leave the car warming up for a while, it might update even without rolling (don't remember if this car does that or not). But for sure within a mile. If you swapped sensors, I believe you need to 'reset' the system from the TPMS menu first, but don't remember for sure. Check the manual if that's the case. Hope this helps.

 

Issue solved: It didn't "learn" after more than 100 miles. There is no TPMS system 'reset' as far as I can find in the manual or car. BUT, changed tire type to 'winter' and back to 'summer' and magically the system relearned the pressures and was satisfied enough to turn of the idiot messages! Fingers crossed.

 

THAT is the reset, now that I remember. Ha ha. So it's not in the manual? Thought it was. Must have read it here. Will now write it on my service history, in case I forget. Glad it solved your issue. Hopefully permanently. Take care.