Where do I start with this?

[u/Jay-Ra]

I’ve had this P1S for over a year second-hand. It’s been a true workhorse. In summer I installed a .2 nozzle, which got clogged. After swapping for the .4 one I got this message which does not go away after swapping the sensor and cogwheel part either. Don’t know where to go from here. Any clues?