Tyre pres­sure sen­sors

Car Mechanics (UK) - - Help! -

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.

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