The worst part is that it is to become mandatory on all new cars from 2014. Maybe there's a business opportunity in repairing TPMS systems which don't work.

When i changed over to my newly purchased winter wheels they never had TPMS fitted so i planned on switching it off with my IID Tool. I suspected it may not be working as I had never had an alert from it - especially given that I have an LPG thank where the spare should be - it never noticed that the spare was missing.

Anyway, after a few journeys I got the dreaded BONG and TPMS alert on the dash - so out with the IID Tool and deactivated it - job done

Makes me wonder how it monitors the spare wheel though - my car didn't even notice it was missing  Stolen / Gone: 2006MY Supercharged LPG Autobiography - Zambezi Silver with Sand/Jet/Jet Oxford Leather.....

There are 2 set ups for the TPMS, one which monitors the spare wheel and one which does not, can't remember the reason why there are the 2 set-up, but it is somewhere in the workshop manual (Topix) 56 TDV8 Vogue SE
9 Freelanders, 2x 2002 TD4ES, 2001 TD4, 2002 1.8GS, 2000 XEDI, 2x 2000 1.8ES, 2004 1.8 & 2000 1.8 GS (rolled)
91 Lotus Carlton (sold)
90 Lotus Elan (BRG)