I have just changed the keyfob on my 2008 Ford Mondeo TDCI as was in bad state of repair , i placed my transponder and key blade into the new fob , the doors open and shut excellent now but when i went to start the car it has came up " Active Immobiliser " , i have only just bought the car with only 1 key , any ideas what the problem could be ?
Sound like the chip is still in the old key fob put your old key back to the way it was then turn the ignition on and see if that works
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If the car was perfect before the swap it sounds like you have a damaged chip which will need replacing
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