Tire Pressure Monitoring System alternate reset?

xc17pilot · January 19, 2014

When I put my winter wheels with TPMS on the car (2007 997 C4S) a few weeks ago and tried to have the TPC "learn" the new sensors, it would stay in that mode and never turn off the warning in the instrument cluster. I brought the car back to the reputable indy tire shop (Porsche and other high end specialists) that installed my sensors and they went ahead and replaced them for free with brand new sensors. Now instead of the TPC Inactive/Learning warning I was getting no instrument cluster warnings and the tire pressures were not displaying any values, '--', at all four tires. It would stay like this for about 20 minutes then alarm "TPC Inactive" and I'd get the instrument warnings again. Each time I'd use the OBC TPC reset accessed via the steering wheel OBC selector lever on the left side of steering column.

With new sensors, I was planning to bring my car to the local Porsche dealer this week. Discouraged and while driving, I then had a thought to look through the PCM screens thinking maybe there was some other information available about the fault. I found by selecting the "NAVI" button and then the "SET" button I could see a screen with "Tire Change" as an option. Thinking there was nothing to lose, I went ahead and selected that option and another window came up with "Start Calibration for New Tires? Yes or No? I selected Yes then got another screen stating "Calibration Reset". Low and behold about 10 minutes after continuing to drive all 4 tire pressures showed up.

I've attached the sequence of events pictures, sorry a little shaky as I was driving while attempting this. I'm not sure if anyone else has tried this, I have searched several forums and could not find any write ups. It was a way to try a reset of the system without having to come to a complete stop and an alternate method to try a reset. Anyone know the details about selecting this method vs the steering wheel selector lever?