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Message: <blockquote data-quote="Schwepps" data-source="post: 288997" data-attributes="member: 3592">TPMS is Tyre Pressure Monitoring System, which means actual tyre pressure sensors are placed in the tyres, either valve or rim mounted. The real-time pressures are transmitted by low power radio waves to the OCB system. Fitted in certain markets, especially USA.What we have is the RFI system (Run Flat Indicator) which is just using the wheel rotation sensors of the DCS system to monitor for wheel rotational differences between a low or flat tyre versus the other tyres. IMO it's not very reliable for picking up air loss because I've had one wheel go down to 29psi versus the others at 31 and 34psi (on my staggered setup) and yet the RFI wasn't triggered.Keep in mind that even with RFI, you have to reinitiate the system each time you pump them up. To learn how to do it, see your manual. It's slighty different for iDrive cars.In 11 months I would have checked my tyre pressures 44 times and balanced/aligned/swapped my wheels almost 4 times bro... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>