I have some of these Doblo's in our fleet, And one for the workshop.
I take it this is a non turbo using the Lucas Epic System.
The flow modification, I wouldn't worry about that, (Fiats line on this code is, if no drive ability problems ignore), we see this on all these vans.
The rotor position refers to pump (These are still fairly expensive from Fiat and Fiat exchange units look poor quality so I fit New About £200 more or get original repaired ) or timing belt (only had this problem once after someone tried a tow start in reverse!)or even ECU (these Lucas ECU's can be swapped with no programming required.
As for the air pressure sensor, on intake pipe between air filter and inlet manifold, these engines still run ok even when these are broken (metal rod on flap link).
But first I would check EGR and see if it has been blanked off, if not then try blanking it off or disconnect wiring for EGR and see if it runs, if you disconnect wiring this will flag up an additional code.
These are only suggestions, Don't forget fuses and loose fuses as the terminals in fuse boxes are a little low rent! Plus blocked fuel filters/water in diesel etc etc.
(Its a Fix It Again Tomorrow FIAT)
HTH,
Ian
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