@Shugzter this is the main thread for the Ducato P0401 problem. I personally started this thread, I am a victim of this fiasco, you will also note
@theoneandonly he is the reference boffin for analysing data, between the two of us we probably know 98% about the whole affair.
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please can I recommend that you read each and every page so you know the details.
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You then need to wipe out your silencer tailpipe internally with pieces of kitchen towel, take it for a good run and re-wipe it out. if the kitchen towel comes out sooty then your DPF is internally cracked / burnt.
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the beginning is the problematic early software caused overfuelling, if you get away light then it will have cracked the DPF (circa £3300 plus vat); the soot passing the cracked element will have blocked the LP EGR Cooler, (say £700 plus vat), all plus one day labour at a Fiat dealer as you also need the latest engine software v28 or v32, (we don't know when Fiat choose 28 or 32).
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in worst case the original software burns one or more injectors to a wrecked state, (price, I dont know).
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with a soot blocked cooler the engine is effectively strangled, the engine calls for more air and gives an unachievable instruction to the HP EGR to kick in and and top up the missing air. because its unachievable the software throws the P0401 fault code telling the investigator that the HP EGR is blocked. This is why garages change the HP EGR just because the software says so.
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Me? ive the cooler changed last November and lost all the fault codes, together with
@theoneandonly we are monitoring my results on EGR opening and EGR temperatures to try and figure out how quickly my cooler will re-block.
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Ive been actively searching for a UK rebuild company who can rebuild my DPF, alas I cannot find one.
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Ive also looked at an EGR software delete however those installers ive conversed with have no knowledge of software versions. I would not therefore risk having a remap from somebody who has no knowledge of these peculiar engines and might give me a modified v18 (say) when mine is already 32.
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Ive also been hunting for an engine wiring diagram as I would like to see if the butterfly throttle that is inside the LP EGR could be disabled as its this butterfly closing that strangles the engine.
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Happy reading...........