ahh can some body help my van has been going a treat then went for some diesel come out ov garage jumped in to start it

nothing shopped about done my home work and have been told its my immobilizer

not working can i bypass it. as i would rather do this just to get it going its doing my head in its a ford transit 98 model diesel i would like to do away with the immobilizer all together some one please help thank you ?