Ford Focus engine trouble

I went to start my 2011 Ford Focus 1.6 diesel today and it refused to go. The dash came up with 'engine malfunction - service due'. Any idea what's wrong?
Is a service due? Might be gummed up EGR. But the 115PS 8v 1.6TDCI is generally much more reliable than the previous 110PS 16v 1.6TDCI.
Answered by Honest John on

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