Had this myself last year in the cold weather - codes were something like fuel pressure too high and another too low. Changed the fuel filter (easily do able yourself) and drained out any water in it which made a difference. Also problems if the diesel isn't winter spec and it waxes up on the injectors, causing a juddering flow of fuel which triggers the above codes.
Put some high grade diesel through it (e.g. Shell VPower Diesel) and also some of the Redex cetane booster additive and should clear things out after doing the fuel filter.
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