continental gt tyre pressure sensors

[ferrarimark]

Just had set of GT wheels refurbed, cannot get tyre pressure warning off. Keeps display on tyre pressure not available!!!! I have spoken to Bentley Essex to ensure I am using correct reset proceedure to no avail. The technician has told me they are a poor design and they even have problems with sensors when they change a tyre, this cant be right!!!! 4 sensors @ £90.00 + vat and fitting re balance etc. Any light from anybody out there?? regards Mark