One of my keys fobs looks to have failed. The remote part for opening the doors and boot works ok but when i put the key in the ignition it displays SAFE in the trip odometer. The car will start but shuts down after two seconds. I presume the immobilser unit within the car does not recognise the key and i need a new one. I phoned my local dealer who wants £160 pounds for a complete key assembly consisting of the front blade, rear remote section and coding to the car. Is the transponder in the blade section of the key ? . Is it possible to buy a genuine one elsewhere and get a local locksmith to cut it to match and code it via vagcom myself. The part number within the key on the remote part is 8Z0 837 231 D.