Yes mixing up the ones you know and add 2 unknown, there's your problem. That why you.our systems is blocked . Dpf still needs cleaning or replacing.So I checked the injector codes with MES, turns out the code for 1 was the one for 4 and vice versa. So injectors had been swapped around for some reason. Could this make a difference?
(assuming injectors are 1, 2, 3, 4 looking from left to right)
Just come across your post, i too have p1206 issues with my 2019 ducato. Done a DIY clean myself which appeared to fix the van for 150 miles before returning to limp mode and p1206 again. Not checked injectors but in the process of removing and checking the high pressure EGR and giving it a clean (although i doubt thats the issue).By way of update;
Had the dpf removed and sent to be cleaned.
Initial thoughts were driving fine if a little underpowered. Better mpg. 33 now.
A bit more driving and seems quite underpowered.
And still doing too many regens!
First one after the clean was after 250klm.
Next after 170 or 180.
All looks normal on MES.
Why is it doing regen this often?
What tells it too?
Partly the differential pressure sensor? Can't be faulty as it's a new one. MAP sensor also new.
And why would it be underpowered?
Any thoughts?