I have just put 4 new 225/40R18 (92Y) Vredestein Sessanta XL , on the car over the W / End . Within the first 5 miles of running on them , the Tyre Pressure light came on . Tried to reset but still stayed on , have been to local garage and checked pressures . All are at 2.6 bar . Does any body know why, this has happened . I have had the car for 7 months and the light has never come on before .