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!!
1. In the tire menu, change the tire size from 18" to 19" rims. Drive a bit, then change it back to 18". This will serve as a "reset". From what I recall, it normally takes 5 to 10 miles of driving for the system to relearn everything, assuming the system is OK.
2. Bring it into the dealer since it's still under warranty. The PWIS computer can run a diagnostic on the receiver unit and can tell if there is a problem with the unit or the senders/monitors in each tire.
The TPMS batteries can last from 5-10 years and yes, when they go you have to replace the whole unit, not just the battery. However, with all 4 tires indicating a problem, I don't think it'll be related to the battery.
I don't know if there is a specific fuse to the TPMS system, but if there is, pulling that can also server as a hard reset of the system.
I would take it into the dealer first. The service manager is giving you the worse case scenaro over the phone to cover all their bases. Hopefully it'll be a simple fix and no dismounting of tires will be needed!
I don't show error. Just no readings. Will try setting wheels to 18 driving a little and then back to 19 seeing I have the 19 inch wheels on car and see if that helps. I did find reset but that reset everything and will see what happens later today. Also put more air in to be overinflated and see if it makes a difference.
I had my right rear TPM go out at 30,000 miles and replaced under warranty. My TPMS also showed all dashes and no readouts, though 3 of the 4 worked. I also wouldn't worry about your wheels being abused or scratched. I'm sure your dealer and whoever they use for tire service will take care of your wheels as they do all the other Porsches that get serviced.
Dealership found both rear monitors low battery and replaced sensors. Drove car and reset and issue went away. Interestingly enough wheels were taken off and air let out of tires to replace sensor but never rebalanced tires. I guess easy fix being rears and was able to replace with tire on and pushing tire in enough to get sensor/ valve in place!!
Always great service at Suncoast Porsche in Sarasota Florida!!