Tyre pressure sensors
Q My 2016 Vauxhall Insignia has internal TPMS. For the life of me, I cannot understand why the whole sensor has to be removed when the tyre is changed. Surely the tyre can be replaced in the normal way after the tyre has been deflated, by removing the valve inner core? Geoff Brookes
A The TPMS is a serviceable item and needs to be attended to. The batteries should last between three to seven years, depending on usage. It is accepted that the sensors should be replaced at five-year intervals, but mileage will affect the life of the monitor.
Early sensors were a one-piece design and the valve stem was non-removable. Your Vauxhall should have the later unit with a removable core.
To summarise, the tyre can be changed without removing the TPMS, but as the unit has a limited life it is often replaced at the same time as the tyre.