The display showed my tire pressure was low (-4 on back passenger side tire). I went to get gas station and found the pressure was at 38... I pumpped some air anyways to make it 44... It still showed -2 and then back to -4 again.

1) What's the normal tire pressure for Cayenne S?
2) Has this happened to anyone and how do I reset?

Thank you.

 

try to change TPMS settings - select 19" or 21" and then back to your size.
worked for me

 

happened to me before.
Check your factoy settings on the door, but do what filin mentioned and that should reset.

Did it to mine, and all good now... plus I filled with nitrogen...

now when they fluctuate, it's even all around....