TL* THE CONTACT OWNS A 2008 PORSCHE CAYENNE. WHILE THE CONTACT WAS DRIVING AT AN UNKNOWN SPEED, THE TIRE PRESSURE SYSTEM WARNING INDICATOR ILLUMINATED WITH A FALSE LOW PRESSURE ALERT. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER AND FOUR WHEEL SENSORS WERE REPLACED. ON A SEPARATE OCCASION, THE CONTROL MODULE WAS REPLACED. THE VEHICLE WAS TAKEN TO THE DEALER FIVE TIMES AND THEY ADVISED THE CONTACT THAT THE TIRE PRESSURE STICKER INFORMATION PERTAINING TO THE TIRE PRESSURE SETTING SHOULD BE IGNORED. THE FAILURE PERSISTED WITH NO RESOLUTION. THE FAILURE MILEAGE WAS 4,000. UPDATED 12/20/10 *BF THE CONSUMER STATED THE TPMS HAS NEVER FUNCTIONED PROPERLY. ON MANY OCCASIONS, BUT ONLY DURING HOT WEATHER, IT ISSUED FALSE LOW TIRE PRESSURE WARNINGS ON THE DASH. UPDATED 12/27/10