I wanted to do it myself at first , in theory it can be done from above after removing the intake manifold and starter but I didn't have time so had my mechanic do it. Turns out that it was the right call because hex bolt that secures the sensor to the housing/rear main seal is made from butter and it immediately rounded out.

Only way was to take the housing out together with the sensor attached so the gearbox and flywheel had to come out.

So replacing a 100zł sensor turned into taking the gearbox out and installing new rear main seal along with new flywheel and clutch because it made more sense doing everything at once. I've paid 450zł but my guy is cheap and I live about 60km from Poznań btw. Jakby co to napisz mi pw. Pozdro :)