A faulty TPMS sensor can now result in an immediate MOT failure. As of 1st January 2015 any car manufactured from 2012 onwards that is displaying a TPMS warning light on the dashboard will automatically fail its MOT test. Car dealers want you to bring your car to them to replace the TPMS sensors. Depending on your dealership, expect to spend between £120-£210 per wheel to have them replaced and coded to the OBD (on board diagnostics).