[umbertob]

First off, if you are in North America and you own a 2007 (or later) RRS, you have TPMS. If you have a 2006, check the valve stem on one of the wheels. If it is made of rubber, you don't have TPMS. If it is metal, you do as the aluminum stem is part of the sensor inside the wheel.

 

[umbertob]

The car won't "forget" you don't have sensors and the TPMS fault light will stay on for as long as you don't mount sensors on the running wheels. However, it will automatically recognize new sensors if you install an extra set of compatible ones for your winter wheels. You need to get OEM sensors as, in addition to transmission frequency, the TPMS module reads a specific electronic serial number from the sensors to recognize them and store them in its memory. The ones listed on eBay are a ripoff, they are cheaper to buy from your dealer. Or here: http://www.bputah.com/RR44/Land_Range_R ... _TPMS.html