Thank you for your input.
I managed to found the right part number (1610115580) using my cars vin.
Bought it. Changed it, filled it up with DPF additive and program it (maybe problem here) by the mechanic who used an Autel diagnostic system.
Same, problem not solved!
Finally all worked out!
A brilliant young engineer helped me out with his Diagbox!
No one else could erase the error because there was no apparently communication with the new part (there was communication but not correct so that we could erase the fault!).
Others that proved before suggested that I should buy another one additive tank as if it was faulty that new one also! Other wanted for me to leave the car for a “detailed checkup (dismantle and control all the cables and connections etc). Someone suggested I should exclude the DPF system which I firmly denied as it is illegal!
Anyway. It seems that someone in the beginning selected wrong connection between the ECU and the pump itself obligating the ECU to seek for another type of connection (something called LIN). When we selected the connection type as “wired cable” or something like that it worked like charm.
We erased the errors, refuelled the car and no more problems (I drove it already for 350km!)
I wish I could give more details on what we did but I didn’t thought of it to document the process.
The solving idea came from this YouTuber I hope the video will help you to understand the critical step better!
