nick74
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nick74's post in What have I done this time? was marked as the answer
When my vacuum block was faulty it caused the low EGR flow error to keep popping up. Clear the fault code and it would come back after about 2 days.
It could be that you've replaced your original vacuum solenoid block which had a faulty n75 solenoid but an OK EGR solenoid with a secondhand unit on which the n75 solenoid is OK but the EGR solenoid is knackered!
Unfortunately these are not cheap to buy new, £193 when I bought one a year ago.
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nick74's post in Vacuum box - BKC engine - N75 - No power was marked as the answer
Hi,
I had this part fail on my Octavia (the 1.9 and 2.0 PD engines use the same part number) but with mine it was the EGR control solenoid which failed rather than the N75. Unfortunately you do have to replace the whole thing if one valve inside it dies and it cost about £193 for a new unit :| It's a sealed unit and they really mean 'sealed' - before I threw my old one away I tried to break it open with a hammer and chisel to find what had actually failed inside it but I couldn't even get the casing open!