You cant.Go and get a new key cut and take it to someone with the correct code reader to programme your new key.You may need your V5 and ID to verify you own the car.There aren`t many people on here who will tell you how to by pass an immobiliser.
cdc
July 2012
I can answer this question...
I have lost my keys but I need to start my car. It is a 1999 escort?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix cars.