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I have to stress that I have no direct personal experience of scanning for fault codes, but I see too many reports on this forum where such codes have not given accurate diagnoses. In my opinion those codes need to be interpreted with caution, and considered together with other evidence before concluding where a fault truly exists. Your report of resetting a crankshaft sensor error without affecting the engine problem only emphasises my belief. Did the garage offer any explanation for the engine problem? I can not suggest any particular component is at fault on the evidence we have at the moment. To renew the DPF or EGR more or less at random in the hope that the problem will be cured would be expensive, wasteful, and possibly unsuccessful. Sorry, but I can not offer any more advice.