fiesta 1.5tdci smoke problem

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hi all new member so please bare with me. i bought my wife a 1.5tdci fiesta 2014 model in may, mot was up in august so took fully expecting it all to be fine, it failed badly on emissions, mainly clouds of black smoke. 56k from new and full service history. its has a high maf reading of 5.9gs and i think it should be about 1.2gs. i bought a genuine maf which made no difference, the car had just been on holiday with us and covered 750 miles. only way i could scrape it through was with lots of injector cleaner and take it back red hot, it literally scraped through, you can smell the raw diesel . any ideas before i give up, also had a new dpf.

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