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Immobiliser Active

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#1 babyreecesdaddy



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  • Name: Chris
  • Ford Model: Mk4 Mondeo
  • Year: 2008
  • Location: Renfrewshire

Posted 06 June 2013 - 08:06 PM

Hi all,


My absolute heap of a Mondeo has finally had it's engine rebuilt having suffered head gasket failure.


It's all back together, and we go to start it but convers is coming up immobiliser active.



Battery was flat, now charged.


All connections are good


No faults showing on diagnostic, nor will it give the option to reset immob.


Fuse OK (Left row 4th down)


Tried locking/unlocking


Tried removing battery (Which is 6 months old)




Any ideas?!

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#2 jeebowhite


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  • 22,302 posts
  • Name: James
  • Ford Model: Sea Grey Mondeo MKIV 1.8TDCi 140ps Zetec
  • Year: 2007
  • Location: Kent

Posted 07 June 2013 - 11:33 AM

sounds like the PATS has lost the data. Do you have a spare key you can try?

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