collidg

Hi I am hoping someone could help me or point me in the right direction. I’ve got a 2011 Octavia 1.6 Diesel , original battery went faulty this week and I have just replaced it for a like for like, however the car only starts/ runs for about two seconds and immediately cuts out, it looks/ feels like the immobiliser is kicking in, whilst at the same time you can hear all the door motors clicking in and out, and they keep recycling every 15-20 seconds, numerous dash lights on as well . Tried spare Key fob, manually unlocking doors and disconnecting battery for 40 minutes all to no avail Thanks Is there a procedure for re-synchronising the key transponder back to vehicle, i.e. leaving it in the ignition for a period of time?