Well according to TPS the N263 code does not tell you which side transmission valve (gearbox mounting) is faulty, so it is a guessing game. I ordered an off side and when I put an ohm meter across the terminals of the new valve it gave a steady reading of 18ohms, the old valve however gave a variable reading of between 750 and 1200 ohms, so this was the deciding factor to change this side. I never even bothered to check the readings of the other side.
A bit of a gamble really as the valves are over £230 each and once you plug in the connection TPS will not give a refund.
I've cleared the fault on VCDS so will scan in a few days time and hopefully everything will be clear.
This is the o/s mounting
It looks like salt water corrosion is the cause of the problem
