I have read all the previous posts on this subject but still am unsure. I am showing no readings at all and the system just shows dashes for actual pressure on all 4 wheels?? Surely all 4 monitors can't all be bad or battery not good? I went through changing settings etc but not sure if reset anything and computer says relearning but instrument gauge still shows light and exclamation mark! It wont go away? Dealer says bring it in and they will remove wheels, tires and replace monitors and rebalance but I am hesitant to do that and get my wheels all scratched up etc etc. Told batteries are bad but earlier post says they can last 10 years I have a 2008 Cayman S. I have not changed anything on car and just started car in am and problem started! I dont really see the reset option on menu and may be doing it incorrectly. Also checked pressures manually and put air in all around in case to see if changes anything, no difference. Drove car 30 miles and still show warning light!!