TPMS - Tyre Pressure Monitoring Sensor valves
TPMS valves are already fitted to some vehicles and from late 2012 there will be some form of pressure sensing on all new vehicles.  At the same time VOSA are talking about making it part of the MOT system to check that any sensor valve fitted after Dec 2011 is working correctly.These valves do fail due to battery failure (They normally last 5 to 7 years) or galvanic corrosion making them very brittle and they break easily.Hometyre can replace your sensor valves at prices that beat most local dealers... give us a call for more details.