You need to run a diagnostic scan to see what is going on...the injector control module could be the problem, or a number of other things.
Bro You should start from regulator of high pressure , it's placed on high pressure pomp (common rail). I had same problem. So you have to tell me, you have high pressure pomp made by BOSCH or SIEMENS? If by BOSCH than on back side of pomp you have to find something like that
and remove that , clean by WD-40 and air blow, reinstall and tell me it helped? if not i'll help you on next step
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