Having recently snapped a valve I then found that only a Lexus dealer (no tyre dealer or other car manufacturer) can recode the TPMS to put out the warning lights that appear if you have a non specific valve fitted to get you on the road. I cut the valve stem in half and found the corrosion to be severe. I took the car (2009 GS300 SE L) to Lexus of Croydon. Paid over £611 fro a 40,000 service and a new valve to be fitted by them. On collecting the car I was advised by the service manager they could not recode the car computer system due to one of the other tyres being 1 lb psi below pressure. They could not inflate it because they could not get the valve cap off the stem due to it being seized. Under the new MOT regulations changed on 20 March 2013 a car will now fail MOT if the ATMS warning light is illuminated.
I am now in a formal dispute with Lexus and am awaiting to hear from Toyota head office UK. I have already prepared a letter for Toyota HQ in Japan. I am tenacious by nature and will certainly keep on the case.
I expect Lexus to pay for a problem of their making - not mine.