Ford Repair Questions? Ask a Mechanic for Answers ASAP
This could also be an injector leaking fuel back through the overspill pipe, so not getting enough fuel pressure to tell ECU to fire the injectors, this is trickier to find and you’ll need the garage to do a ‘run back’ test to identify which one is the issue
Lastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.
OK in that case I'd move onto the run back test next
also check that the ECU fuse is has power with the ignition on and the fuse contacts are clean and bright and the fuse is in good condition
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