I have had this warning for some time and BMW say I need the sensor repalcing on one of the wheels and recommend changing all 4 at a cost of £700 as they only usually last 4 years and the car is 5 years old

it is not worth the cost and i do not even use the sensors- is there any way of actually deactivating this warning as it is annoying and i also do not want to spend £700 fixing the problem