Quite sure that is the knock sensor pigtail (replaced mine recently). If you have a VIN I could check in Vida where it should connect to. In case of my 2003 V40 it connects at the back of the engine compartment, under the windshield behind a cover, see photo attached. Note the pigtail in the photo w...

I was able to reset my trim adaptions with the 850 OBD-II app + an ELM327. Vida with a full Dice chip (sadly Mongoose/J2534 doesn't work for us) would be another option. That said, if trims are acting weird (outside of -10 to 10%) and it's not fixing itself then there should be a cause that requires...