I have the PO201 error code which appears randomly every 30Km to 50 Km. The issue sounds possible as the car ran 2000Km with a damaged spark in cylinder 1 before repair.
However, they are no circuits plugged on injectors. They are connected directly to a set of wire. The ʟᴘɢ engine speed varies between 600 to 900 rpm every second and little less when on gasoline.
There is a small box with many pluggable electronics components near the left headlamps, but if it’s inside I’ve no idea each thing belongs to: From what I read (if I’m not wrong) this seems to be an amplifier for giving enough current to actually command the injector from the weak signal coming from the ᴇᴄᴜ.