Technical Twin EGR issues - 'EGR Cooler Syndrome' Symptoms but different Fault Codes - HELP!

[theoneandonly]

As Jackwhoo has said - it not only shuts off completely as part of the engine shutdown (to reduce shudder etc), but plays a very important part in the HPEGR valve throughput (directing gas flow from the HPEGR valve) and thus the complete gas flow of the motor. @theoneandonly there are so many actuators and feedback loops - which is the reason why I urge you to take on a more holistic approach to analysis, as to compare just a couple of parameters in isolation can prove difficult, particularly when an engine has borderline issues. (It is very easy to spot a completely blocked cooler - but more difficult if it is only partially blocking.

Once it has passed a certain degree of blocking the diagnosis is now simple and rectivation a known route, However, why do people still have difficulties getting a Fiat Pro Dealer to resolve this Problem? Is there an advantage to jumping to an early partial blocking diagnosis, when other issues may be present or even if not. Is there some methodology that could be used for those that periodicaly clean the LPEGR cooler to identify how much time or distance to a P0401? This could be useful for a number of people.