K12 Not Starting - Immobiliser Problem?

Ive just had my electric power steering pump replaced as the light had come on and there was no power steering. The battery was disconnected before doing this. After this the car doesnt seem to want to start, all lights come up on the dash? If left for a while it starts and drives as normal but with the immobiliser light on.

Any ideas on how i can get this sorted?

Cheers
 
Thanks for that that frank, yep same problem but my car actually fails to start sometimes.

What is the trick used by pressing the accelerator?
 
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