Edit: sensor 1 is the oil pressure switch and sensor 2 is the reduced oil pressure switch. Below both of those straight into the filter housing is the piston cooling nozzle control valve (the empty hole in your photo).
After searching ETKA it seems there is a secondary oil temp sensor, part code 06K919525. If correct it is probably the little fucker that's been giving me bad oil sensor readings. I'm still not sure if it is the blue one in the first pic or not.
So what happened l? What sensor was giving you wrongm temperature of the oil? I just replaced the pressure sensor and above 230 it's showing me an error.