Focus 2.0 tdci ecu code

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Hi got a mate whose having probs with his 2.0 tdci not starting/cranking after exhausting all avenues he's decided Togo for a second hand ecu clock lock set question is the four figure code on it I think it's called the catch code is this relevant if buying a full kit I've told him to watch for dpf and non dpf as I think they would differ is there any guide to as what's what help appreciated